2025-

2025年

●(invited) K. Kimura, H. Imada, I. Katayama and Y. Kim, "Development of single-molecule terahertz-field-driven scanning tunneling luminescence spectroscopy," 2025 Annual Meeting of the Physical Society of Taiwan (Kaohsiung, Taiwan, 14-16 January, 2025).

2020-2024

2024年

●A. Maeshiro, R. Tamaki, J. Takeda, I. Katayama, "Performances of Chirped-Pulse Single-Shot Ultrafast Spectroscopy with Dispersion Compensation," Tu-29, International School and Symposium on Nanodevices and quanTum Technologies (ISNTT 2024),

(Atsugi, 2-6 December, 2024).

●M. Kaiho, A. Kishioka, K. Uchida, S. Kusaba, R. Tamaki, J. Takeda, K. Tanaka, T. Matsunaga, I. Katayama, "Anisotropy and Relative Phases of High Harmonic Generation in Ti-Based Metallic Materials," We-32, International School and Symposium on Nanodevices and quanTum Technologies (ISNTT 2024), (Atsugi, 2-6 December, 2024).

●(Invited) I. Katayama, "Terahertz scanning tunneling microscopy for locally generating excited states and surface nano-manufacturing," the 12th International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW2024), (Guangzhou, China, 15-18 November, 2024).

●R. Tamaki, K. Takahashi, T. Arikawa and I. Katayama, "Single-shot terahertz waveform detection of resonant tunneling diode in time-domain," ***講演番号***, 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), (Perth, Australia, 1-6 Sept. 2024).

●(Keynote) K. Kimura, R. Tamaki, H. Imada, I. Katayama, J. Takeda and Y. Kim, "Single-molecule electroluminescence induced by THz-field-driven electron tunneling,"  ***講演番号***, 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), (Perth, Australia, 1-6 Sept. 2024).

●D. Kim, M. Kawaj, R. Tamaki, S. Kusaba, Y. Wang, Y. Shuang, Y. Sutou, I. Katayama, and J. Takeda, "Nanoscale Phase Change of Cr2Ge2Te6 Thin Films Induced by Terahertz Near-fields," Mo2F-3, the 16th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2024), (Incheon, Korea, 4-9 August 2024).

●S. Kusaba, H. Lin, R. Tamaki, I. Katayama, J. Takeda, G. A. Blake, "Terahertz coherent excitation of Raman-active phonons in van-der-Waals semiconductor WSe2," Fr-1A.4, the 23rd International Conference on Ultrafast Phenomena, (Barcelona, Spain, 15–19 July 2024).

●T. Okamoto, R. Yoshioka, K. Hiura, K. Nagai, Y. Shinohara, H. Mashiko, Y. Kunihashi, K. Kato, Y. Sekine, H. Hibino, I. Katayam, J. Takeda, H. Sanada, K. Oguri, "Ultrafast Time-Resolved ARPES based on sub-10-fs Pump and Probe Pulse Configuration," We-PO.56, the 23rd International Conference on Ultrafast Phenomena, (Barcelona, Spain, 15–19 July 2024).

●K. Nagai, R. Yoshioka, T. Okamoto, K. Hiura, Y. Shinohara, Y. Kunihashi, K. Kato, H. Mashiko, Y. Sekine, H. Hibino, I. Katayama, J. Takeda, H. Sanada, K. Oguri, "Observation of intervalley scattering dynamics on a 10 fs scale with time-resolved ARPES," Mo-2B.3, the 23rd International Conference on Ultrafast Phenomena, (Barcelona, Spain, 15–19 July 2024).

●R. Tamaki, M. Fukuoka, I. Morohashi, I. Katayama, "Ultrafast Detection of Pulse Profiles via Chirped-Pulse Up-Conversion," ALPS14-04, Optics and Photonics International Congress (Yokohama, Japan, 22-26 April 2024).

●(Invited) K. Oguri, R. Yoshioka, K. Nagai, Y. Shinohara, T. Okamoto, Y. Kunihashi, K. Kato, H. Mashiko, Y. Sekine, H. Hibino, I. Katayama, J. Takeda, H. Sanada, "Time- and angle-resolved photoemission spectroscopy for nonequilibrium excitonic state in bulk WSe2," LSC3-03, Optics and Photonics International Congress (Yokohama, Japan, 22-26 April 2024).

●(Invited) S. Kusaba, "Sum-frequency Excitation of Excitons and Phonons in van-der-Waals Semiconductor," LSC8-03, Optics and Photonics International Congress (Yokohama, Japan, 22-26 April 2024).

2023年

●R. Tamaki, J. Takeda, and I. Katayama, “Single-Shot Terahertz Waveform Detection by Chirped-Pulse Up-Conversion Spectroscopy with Dispersion Compensation”, Tu-PM2-1-6, 48th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2023), (17-22 September 2023, Montreal, Canada).

●K. Kumagai, R. Tamaki, G. Asai, Y. Takigawa, J. Takeda, and I. Katayama, “Terahertz radiation and resultant surface profile during femtosecond laser ablation process”, PEW-06, The 12th Asia-Pacific Laser Symposium (APLS 2023), (4-7 September, 2023, Hakodate, Japan).

● K.Takahashi, T.Arikawa,R.Tamaki,I.Katayama " Measuring terahertz electric-field waveforms of continuous wave terahertz sources using single-shot terahertz time-domain spectroscopy",ETu1-04, The 12th Asia-Pacific Laser Symposium (APLS 2023), (4-7 September, 2023, Hakodate, Japan).

●J. Takeda, K. Kimura, H. Imada, Y. Kim, and I. Katayama, (Invited Talk) “THz-field-driven Scanning Tunneling Microscopy Under Strong THz Field”, A-1658, 11th International Conference on Materials for Advanced Technologies (ICMAT 2023), (26th -30th June 2023, Singapore).

●I. Katayama, K. Takahashi, T. Arikawa, R. Tamaki, “Singleshot Detection of Terahertz Waveforms Generated from an Impact Avalanche and Transit Time (IMPATT) Diode”, A-2237, 11th International Conference on Materials for Advanced Technologies (ICMAT 2023), (26th -30th June 2023, Singapore).

2022年

●K. Kimura, Y. Morinaga, H. Imada, I. Katayama, K. Asakawa, K. Yoshioka, Y. Kim, and J. Takeda, (ULVAC Prize at IVC-22 for Young Researcher) “Investigation of STM-luminescence Induced by THz-field-driven Tunneling Electrons”, Thu-F2-5, THE 22ND INTERNATIONAL VACUUM CONGRESS (IVC-22) (Sapporo, Japan, 9.11. SUN-16. FRI, 2022).

●S. Bae, K. Matsumoto, H. Raebiger, Ø. S. Handegård, T. Nagao, M. Kitajima, J. Kono, J. Takeda, and I. Katayama, “Higher-order Optical Response of Acoustic Phonon Generation in Monolayer MoSe2 Observed by Sub-10-fs Coherent Phonon Spectroscopy”, Tue-J2-2, THE 22ND INTERNATIONAL VACUUM CONGRESS (IVC-22) (Sapporo, Japan, 9.11. SUN-16. FRI, 2022).

●R. Tamaki, T. Kasai, G. Asai, D. Hata, H. Kubo, Y. Takigawa, J. Takeda, and I. Katayama, “Femtosecond Ablation Dynamics Observed with Terahertz Radiation”, 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2022), (Delft, Netherlands, 28 August–02 September, 2022).

●R. Yoshioka, Y. Shinohara, T. Okamoto, Y. Kunihashi, K. Kato, H. Mashiko, Y. Sekine, H. Hibino, I. Katayama, J. Takeda and K. Oguri, “Dynamical Band Imaging of Simultaneous Light-dressed Volkov State and Photo-induced Carrier State in WSe2 Using High-harmonic-based Tr-ARPES”, 8th International Conference on Attosecond Science and Technology (ATTO VIII), IIA-T67 (Orland, Florida, USA, July 11-15, 2022).

●Ryo Tamaki, Masashi Suzuki, Jun Takeda, and Ikufumi Katayama, “Chirped-Pulse Up-Conversion Spectroscopy with Dispersion Compensation Applicable to Terahertz Waveform Detection in Time-Domain”, 23rd International Conference on Ultrafast Phenomena (UP2022), (Hybrid Event, Montreal, Canada, 18-22 July 2022, on-line).

2021年

●Ikufumi Katayama, “Single shot terahertz and ultrafast spectroscopy for investigation of laser-induced irreversible phenomena”, OSK-OSA-OSJ Joint Symposia on Optics, 5-7 July 2021 (5th July 2021, Invited).

●Ikufumi Katayama, “Singleshot Ultrafast and Terahertz Spectroscopy using Echelon Mirrors, and Beyond”, the 10th International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 16-19 June 2021 (19th June 2021, Invited).

2020年

●M. Kobayashi , Y. Arashida, K. Asakawa, K. Konishi, J.Yumoto , M. Gonokami , J. Takeda, I.Katayama,” M4A.23 Ultrafast Dynamics in Ge2Sb2Te5 Thin Films during Laser-Induced Successive Surface Modification”, International Conference on Ultrafast Phenomena 2020, (16-19 November 2020,).

2015-2019

2019年

●J. Takeda, K. Yoshioka, K. Asakawa, Y. Arashida, and I. Katayama, “Ultrafast Electron Manipulation on the Nanoscale with Phase-Controlled Near Fields,” Tsu-A2-5, International Symposium on Hybride Quantum System 2019 (HQS2019), (1-4 December, Matsue, Japan).

●I. Katayama, T. Hagiwara, H. Kawakami, K. Asakawa, Y. Arashida, Y. Minami, O. S. Handegard, T. Nagao, and J. Takeda, “Nonlinear Terahertz Responses of Dirac Electrons in Bi1-xSbx Nano-Films,” Mon-A2-3, International Symposium on Hybride Quantum System 2019 (HQS2019), (1-4 December, Matsue, Japan).

●D. Kim, K. Asakawa, S. Yaguchi, K. Yoshioka, I. Katayama, Y. Arashida, S. Yoshida, H. Shigekawa, M. Kuwahara, and J. Takeda, “Nanoscale Amorphization of Ge2Sb2Te5 by Laser-Driven STM,” P19, International Symposium on Hybride Quantum System 2019 (HQS2019), (1-4 December, Matsue, Japan).

●K. Asakawa, K. Kimura, Y. Morinaga, K. Yoshioka, M. Horikawa, Y. Arashida, H. Imada, I. Katayama, Y. Kim, and J. Takeda, “Development of Low-Temperature THz-Driven Scanning Tunneling Microscope,” P25, International Symposium on Hybride Quantum System 2019 (HQS2019), (1-4 December, Matsue, Japan).

●K. Asaga, H. Mashiko, Y. Chisuga, A. Oshima, T. Nishikawa, I. Katayama, J. Takeda, H. Gotoh, and K. Oguri, “Actively Stabilized XUV Interferometer with Attosecond Time Resolution,” International School and Symposium on Nanoscale Transport and Photonics 2019 (ISNTT2019), (18-22 November, Atsugi, Japan).

●J. Takeda, K. Yoshioka, Y. Arashida, and I. Katayama, (Invited Talk) “Ultrafast Electron Manipulation Using THz Scanning Tunneling Microscopy With Tailor-Made Near Fields,” International Photonics and OptoElectronics Meetings (POEM 2019), (11-14 November 2019, Wuhan, China).

●G. T. Noe, T. Makihara, X. Li, K.Hayashida, N. M. Peraca, K. Tian, S. Cao, I. Katayama, J. Takeda, D. Turchinovich, H. Nojiri, M. Bamba, and J. Kono, “Ultrastrong Coupling of Two Terahertz Magnon Modes in YFeO3 in Pulsed High Magnetic Fields,” International Photonics and OptoElectronics Meetings (POEM 2019), (11-14 November 2019, Wuhan, China).

●K. Izumi, K. Kawana, M. Kobayashi, Y. Arashida, J. Takeda, and I. Katayama, “Single-Shot Detection of Terahertz Waveforms Using Non-Collinear Time-Encoding Technique,” 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2019), (1-6 September 2019, Paris, France, Oral).

●Masataka Kobayashi, Yusuke Arashida, Genki Yamashita, Eiichi Matsubara, Masaaki Ashida, Jeremy A. Johnson, Ikufumi Katayama,"High-acquisition-rate single-shot pump-probe measurement using chirped-fiber Bragg gratings", CLEO/Europe-EQEC 2019, CF-P.2, Munich, Germany, 23th June, 2019.

●H. Mashiko, Y. Chisuga, K. Asaga, I. Katayama, J. Takeda, T. Nishikawa, K. Oguri, and H. Gotoh, “Attosecond Correlation with Actively Stabilized Extreme Ultraviolet Interferometer,” 7th International Conference on Attosecond Science and Technology (ATTO2019), (1-5 July 2019, Szeged, Hungary).

●Kanta Asakawa, Shotaro Yaguchi, Katsumasa Yoshioka, Ikufumi Katayama, Yusuke Arashida, Shoji Yoshida, Hidemi Shigekawa, Masashi Kuwahara, and Jun Takeda, "Nanoscale phase change on Ge2Sb2Te5 induced by laser-driven STM", Canada-Japan Workshop on Hybrid Quantum Systems (HQS), Ottawa, Canada, June, 2019.

●X. Li, K. Yoshioka, Q. Zhang, F. Katsutani, W. Gao, N. Marquez, T. Noe, J. Watson, M. Manfra, I. Katayama, J. Takeda, and J. Kono, (Invited Talk) “Observation of Narrow-Band Terahertz Gain in Two-Dimensional Magnetoexcitons,” The Conference on Lasers and Electro-Optics (CLEO 2019), (5-10 May 2019, San Jose, USA, Oral).

●K. Asaga, H. Mashiko, Y. Chisuga, I. Katayama, J. Takeda, T. Nishikawa, K. Oguri, and H. Gotoh, “Actively Stabilized Extreme Ultraviolet Attosecond Interferometer,” The 8th Advanced Lasers and Photon Sources (ALPS2019), (22-25 April 2019, Yokohama, Japan, Oral).

2018年

●K. Yoshioka, I. Katayama, Y. Arashida, A. Ban, Y. Kawada, K. Konishi, H. Takahashi, and J. Takeda, “In-situ Tailoring of Single-cycle Near Field in a Tunnel Junction Using Phase-controlled THz-STM,” 22C23, 14th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN-14), (21-25 October 2018, Sendai, Japan, Oral).

●H. Mashiko, Y. Chisuga, K. Oguri, I. Katayama, J. Takeda, and H. Gotoh, “Petahertz Electronic Oscillation in Cr:Al2O3 Solid Characterized by Fourier Transform Extreme Ultraviolet Attosecond Spectroscopy,” The 9th Asian Workshop on Generation and Application of Coherent XUV and X-ray Radiation (9th AWCXR), (16-17 October 2018, Sapporo, Japan).

●J. Takeda, K. Yoshioka, Y. Minami, Y. Arashida, and I. Katayama (Keynote Talk), “THz-Field-Driven Electron Tunneling On The Nanoscale,” 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018), (9-14 September 2018, Nagoya, Japan).

●Y. Kawada, K. Yoshioka, Y. Arashida, I. Katayama, J. Takeda, and H. Takahashi, “Spectroscopic Measurement of Birefringent Materials By Simultaneous Acquisition of Two-polarization State THz Pulse Responses,” 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018), (9-14 September 2018, Nagoya, Japan).

●I. Katayama, Y. Minami, Y. Arashida, O. S. Handegard, T. Nagao, M. Kitajima, and J. Takeda (Invited Talk), “Nonlinear Terahertz Dynamics of Dirac Electrons in Bi Thin Films”, SPIE Optics + Photonics 2018 (19-23 August 2018, San Diego, USA).

●Y. Chisuga, H. Mashiko, K. Oguri, I. Katayama, A. Suda, J. Takeda, and H. Gotoh, "Electric Dipole Oscillation in Solids Characterized by Fourier Transform Extreme Ultraviolet Attosecond Spectroscopy", International Conference on Ultrafast Phenomena 2018, TUE.1.6 (15-20 July 2018, Hambrug, Germany).

●I. Katayama, H. Kawakami, K. Araki, Y. Arashida, Y. Minami, L-W. Nien, O. S. Handegard, T. Nagao, M. Kitajima, and J. Takeda, "Ultrafast Carrier Generation in Bi1-xSbx Thin Films Induced by Intense Monocycle Terahertz Pulses", International Conference on Ultrafast Phenomena 2018, TUE.PO.14 (15-20 July 2018, Hambrug, Germany).

●K. Yoshioka, I. Katayama, Y. Arashida, A. Ban, Y. Kawada, H. Takahashi, and J. Takeda, "Sub-Cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-Cycle THz Near-Fields", International Conference on Ultrafast Phenomena 2018, FRI.2.2 (15-20 July 2018, Hambrug, Germany).

●J. Takeda, K. Yoshioka, Y. Arashida, and I. Katayama (Invited Talk), “Nanoscale Electron Manipulation Using Phase-controlled THz Near-fields”, The Conference on Lasers and Electro-Optics (CLEO 2018), (13-18 May 2018, San Jose, USA).

●Y. Minami, T. D. Dao, T. Nagao, M. Kitajima, J. Takeda, and Ikufumi Katayama, “Carrier Multiplication in Bismuth Investigated with Intense THz pump-THz Probe Spectroscopy”, The Conference on Lasers and Electro-Optics (CLEO 2018), (13-18 May 2018, San Jose, USA).

●G. T. Noe, X. Li, J. A. Horowitz, K. Yoshioka, F. Katsutani, N. Yuan, M. Xiang, K. Xu, Z. Jin, S. Cao, H. Nojiri, I. Katayama, J. Takeda, D. Turchinovich, and J. Kono, “Coherent Terahertz Excitation of Magnons to 30 T”, The Conference on Lasers and Electro-Optics (CLEO 2018), (13-18 May 2018, San Jose, USA).

2017年

● K. Yoshioka, I. Katayama, B. Atsuhiko, Y. Arashida, Y. Kawada, H. Takahashi, and J. Takeda, "Sub-Cycle THz Control of Electrons in a Tunnel Junction with a Carrier-Envelope Phase Shifter", The 8th International Symposium on Terahertz Nanoscience (TeraNano 8), (20-23, November 2017, Okayama).

● H. Mashiko, K. Oguri, Y. Chisuga, H. Masuda, T. Yamaguchi, A. Suda, I. Katayama, J. Takeda, and H. Gotoh (Invited Talk), "Petahertz Optical Drive with Wide-Bandgap Materials", IEEE Photonics Conference (IPC2017), (1-5 October 2017, Florida).

● M. Kobayashi, Y. Arashida, Y. Minami, J. Takeda, J. A. Johnson and I. Katayama, " High-Repetition-Rate Single-Shot Spectroscopy of Photoinduced Phase-Change Materials", The 24th Congress of the International Commission for Optics (ICO-24), (21-25 August 2017, Tokyo).

● H. Mashiko, K. Oguri, Y. Chisuga, H. Masuda, I. Katayama, J. Takeda, and H. Gotoh, "Petahertz Electron Dynamics with Wide-Bandgap Semiconductor", The 6th International Conference on Attosecond Physics (ATTO2017), (2-7 July 2017, Xi’an, China).

● T. Kuribayashi, Y. Arashida, I. Katayama, and J. Takeda, "Ferroelectric Phonon-Polariton Dynamics in a Wide Temperature Range Revealed via Single-Shot Spectroscopy",The Conference on Lasers and Electro-Optics(CLEO 2017), FTh3F.1 (14-19 May 2017, San Jose, USA).

● I. Katayama, R. Xu, Y. Minami, K. Yanagi, M. Kitajima, and J. Takeda, "Chirality Dependent Coherent Phonon Dynamics in Carbon Nanotube Solutions",The Conference on Lasers and Electro-Optics(CLEO 2017), (14-19 May 2017, San Jose, USA).

2016年

● Ikufumi Katayama,“Terahertz-field-induced tunneling in metals and semi-metals",International Workshop on Terahertz Nanoscience and Nanotechnology,Memorial Hall (E1-115), School of Engineering, Osaka University, March 9th, 2017(Invited talk)

● Katsumasa Yoshioka, Ikufumi Katayama, Yasuo Minami, Masahiro Kitajima, Shoji Yoshida, Hidemi Shigekawa, and Jun Takeda, “Ultrafast Manipulation of Electron Transfer in a Tunnel Junction using Carrier-Envelope Phase Controlled THz-STM”, 24th International Colloquium on Scanning Probe Microscopy (ICSPM24), Hawaii, USA, Dec. 2016. (Oral presentation)

● Katsumasa Yoshioka, “Real-Space Coherent Manipulation of Electrons in a Single Tunnel Junction by Single-Cycle Terahertz Electric Fields”, The 2nd international symposium on Recent Trends in Analysis Techniques for Functional Materials and Devices, Osaka, Japan, Jan.19th, 2017. (Invited talk)

● I. Katayama, M. Kobayashi, Y. Minami, J. Takeda, C. L. Johnson, P. D. Salmans, N. R. Ellesworth, and J. A. Johnson, "Single-shot Terahertz Detection Using a GHz Bandwidth Oscilloscope", 41st International Conference on Infrared, Millimater and Terahertz Waves (IRMMW-THz 2016), M4B.4 (25-30 September 2016, Copenhagen, Denmark).

● T. Kuribayashi, Y. Shiozawa, Y. Minami, I. Katayama, and J. Takeda, "Real-Time Mapping of High-Frequency Phonon-Polariton Dispersions in Ferroelectric LiNbO3", 41st International Conference on Infrared, Millimater and Terahertz Waves (IRMMW-THz 2016), T3D.5 (25-30 September 2016, Copenhagen, Denmark).

● K. Yoshioka, I. Katayama, Y. Minami, M. Kitajima, S. Yoshida, H. Shigekawa, and J. Takeda, "Coherent Control of the Motion of Electrons in a Tunnel Junction via Single-Cycle THz Electric Field", 41st International Conference on Infrared, Millimater and Terahertz Waves (IRMMW-THz 2016), W2E.2 (25-30 September 2016, Copenhagen, Denmark).

● M. Kobayashi, J. A. Johnson, Y. Minami, C. L. Johnson, P. D. Salmans, N. R. Ellsworth, J. Takeda, I. Katayama, "Fast-Frame Single-Shot Acquisition of Ultrafast Waveforms", International Conference on Ultrafast Phenomena 2016 , UTh4A.28, (17 - 22 July, Santa Fe, USA).

● I. Katayama, K. Maekawa, Y. Minami, M. Kitajima, K. Yanagi, J. Takeda, "Femtosecond Carrier Dynamics of Metallic Single-Walled Carbon Nanotubes under Applied Bias-Voltage", International Conference on Ultrafast Phenomena 2016 , UW4A.16, (17 - 22 July, Santa Fe, USA).

● K. Yoshioka, I. Katayama, Y. Minami, M. Kitajima, S. Yoshida, H. Shigekawa, J. Takeda,"Real-Space Control of the Electron Transfer in a Tunnel Junction with Single-Cycle THz Electric Field", Ultrafast Dynamics at the Nanoscale 2016 , (13 - 16 July, Okinawa, Japan).

2015年

● R-J. Xu, I. Katayama, Y. Minami, M. Kitajima, K. Yanagi, and J. Takeda, "Chirality Determination of Carbon Nanotube Solution Using Coherent Phonon Spectroscopy", The 16th International Conference on the Science and Application of Nanotubes (29 June - 3 July, Nagoya, Japan).

● I. Katayama, K. Maekawa, K. Sato, Y. Minami, K. Yanagi, M. Kitajima, and J. Takeda, " Dynamics of Coherent Phonons in Metallic Single-walled Carbon Nanotubes", The 16th International Conference on the Science and Application of Nanotubes (29 June - 3 July, Nagoya, Japan).

● I. Katayama, K. Sato, Y. Minami, M. Kitajima, K. Yanagi, and J. Takeda, "Electronic and Coherent-Phonon Resonances in Metallic Single-Walled Carbon Nanotubes", The 9th International Symposium on Ultrafast Surface Dynamics, (May 25-29, 2015, Lake Biwa, Japan, Oral).

● Y. Minami, K. Masuda, K. Horiuchi, M. Kitajima, J. Takeda, and I. Katayama, "Long-lived Photoexcited Carriers in Si Revealed via THz Single-shot Spectroscopy", The 9th International Symposium on Ultrafast Surface Dynamics, (May 25-29, 2015, Lake Biwa, Japan, Oral).

● K. Shudo, N.Sugiyama, I.Katayama, M. Kitajima, and J. Takeda, "Ultrafast Expansion of Vibronic Modes in Alkanthiol Chain Adsorbed on Silver Nano-particles", The 9th International Symposium on Ultrafast Surface Dynamics, (May 25-29, 2015, Lake Biwa, Japan, Poster).

● I. Katayama, K. Masuda, K. Horiuchi, Y. Minami, and J. Takeda, "Terahertz Response of Long-lived Photoexcited Electrons in Silicon Observed Using Singleshot Terahertz Spectroscopy", The Conference on Lasers and Electro-Optics (CLEO 2015), STu4H.4 (May 10-15, 2015, San Jose, USA, Oral).

● Y. Minami, T. D. Dao, T. Nagao, J. Takeda, M. Kitajima, and I. Katayama, "Electron Dynamics in a Gold Thin Film Accelerated via an Intense Terahertz Field", The Conference on Lasers and Electro-Optics (CLEO 2015), STu4H.2 (May 10-15, 2015, San Jose, USA, Oral).

● J. Takeda, Y. Minami and I. Katayama (Invited Talk), "Broadband Single-Shot Spectroscopy Applicable to Photoinduced Nonlinear Dynamics", Korea-Japan Joint Symposium on Semiconductor Physics and Nanophotonics, (22 April 2015, Daejeon, Korea, Oral).

2010-2014

2014年

● I. Katayama, K. Maekawa, K. Sat, Y. Minami, K. Yanagi, M. Kitajima and J. Takeda, "Fermi Energy Dependence of High-Frequency Coherent Phonons in Metallic Carbon Nanotubes", Internatinal Symposium on Computics: Quantum Simulation and Design (ISC-QSD2014), (1-3 December 2014, Tokyo).

● Y. Minami, K. Araki, T. D. Dao, T. Nagao, J. Takeda, M. Kitajima, and I. Katayama, "Nonlinear Dynamics of Electrons on Dirac-Like Band in Semi-Metal Bismuth Induced by an THz Electric Pulse", Internatinal Symposium on Computics: Quantum Simulation and Design (ISC-QSD2014), (1-3 December 2014, Tokyo).

● W. Oba, I. Katayama, Y. Minami, T. Saiki and J. Takeda, "Single-Shot Visualization of Ultrafast Amorphization in Chalcogenide Alloy Thin Films", Internatinal Symposium on Computics: Quantum Simulation and Design (ISC-QSD2014), (1-3 December 2014, Tokyo).

● K. Yoshioka, Y. Minami, T. D. Dao, T. Nagao, K. Shudo, J. Takeda, M. Kitajima and I. Katayama, "Nonlinear Response of Au Nanostructures Observed with Intense THz Pulses", 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2014), T5-P16.4 (14-19 September 2014, Tucson, USA). [Best Student Paper/Presentation Award, 2nd place]

● Y. Minami, T. D. Dao, T. Nagao, J. Takeda, M. Kitajima, and I. Katayama, "Nonlinear Carrier Responses in Gold Thin Films Induced by Intense Terahertz Waves", 19th International Conference on Ultrafast Phenomena, P1.29 (7-11 July 2014, Okinawa, Japan).

● K. Maekawa, K. Sato, Y. Minami, I. Katayama, J. Takeda, K. Yanagi, M. Kitajima, "Electrochemical Control of Coherent Phonon Generations in Single-walled Metallic Carbon Nanotubes", 19th International Conference on Ultrafast Phenomena, P1.42 (7-11 July 2014, Okinawa, Japan).

● W. Oba, I. Katayama, Y. Minami, T. Saiki, and J. Takeda, "Single-shot Real-time Observation of Ultrafast Amorphization in Ge2Sb2Te5 Thin Film", 19th International Conference on Ultrafast Phenomena, P2.38 (7-11 July 2014, Okinawa, Japan).

● K. Araki, Y. Minami, T. D. Dao, T. Nagao, J. Takeda, M. Kitajima, and I. Katayama, "Nonlinear Carrier Dynamics in Semi-Metal Bismuth Induced by Intense Terahertz Field", 19th International Conference on Ultrafast Phenomena, P3.29 (7-11 July 2014, Okinawa, Japan).

● Y. Minami, K. Araki, T. D. Dao, T. Nagao, J. Takeda, M. Kitajima, I. Katayama, "Carrier Dynamics of a Bismuth Thin Film Accelerated via Intense Terahertz Field", The Conference on Lasers and Electro-Optics (CLEO 2014), JW2A.62 (San Jose, USA, June 8-13, 2014, Poster).

● I. Katayama, M. Bito, E. Matsubara and M. Ashida, "Broadband Terahertz Generation Approaching Optical Communication Frequency Using Tilted DAST Crystals", The Conference on Lasers and Electro-Optics (CLEO 2014), JTu4A.86 (San Jose, USA, June 8-13, 2014, Poster).

● Isao Morohashi, Ikufumi Katayama, Yoshihisa Irimajiri, Masaya Nagai, Yu Chiba, Masaaki Ashida, Norihiko Sekine, and Iwao Hosako、"Direct Measurement of THz Comb Signals Using a Subharmonic Mixer in the 600 GHz-Band", 4th EOS Topical Meeting on Terahertz Science & Technology, no. 28 (Camgli, Italy, May 11-14, 2014, Invited talk).

● M. Ashida, E. Matsubara and I. Katayama, "Ultra-broadband IR and THz generation and detection with ultrashort pulses", Photonics West 2014, 8964-7 (San Francisco, USA, February 1-6, 2014, Invited talk).

2013年

● M.Moriyama, N.Sugiyama, K.Shudo, I.Katayama, M.Kitajima and J.Takeda, " Ultrafast Measurements of Vibrations on Defective MoS2 Surface", 12th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures, 5PN-43 (Nov. 4-8, 2013, Tsukuba).

● K.Shudo, T.Satake and J.Takeda, "Excited and Ground States of Benzene Molecules Adsorbed on Si(001) Surface", 12th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures, 8aC1-5 (Nov. 4-8, 2013, Tsukuba).

● J. Takeda, I. Katayama, K. Shudo and M. Kitajima (Invited Talk), "Coherent Phonon and Surface-Enhanced Raman Scattering Dynamics in Solids", 18th International Conference on Dynamical Processes in Excited States of Solids, II-1 (August 4-9, 2013, Fuzhou, China).

● I. Katayama, Y. Hayashi, K. Masuda, Y. Minami, and J. Takeda, " Single-shot Terahertz Spectrometer Using an Echelon Mirror and Air Plasma", The 10th Conference on Lasers and Electro-Optics Pacific Rim, and The 18th OptoElectronics and Communications Conference, MC2-4 (30 June - 4 July 2013, Kyoto, Japan, Oral).

● T. Ohshima, Y. Minami, I. Katayama and J. Takeda, "Broadband THz Time-Domain Spectroscopy of Halogen-Bridged Platinum Complexes", The 10th Conference on Lasers and Electro-Optics Pacific Rim, and The 18th OptoElectronics and Communications Conference, WPC-2 (30 June - 4 July 2013, Kyoto, Japan, Poster).

● M. F. Avila-Ortega, I. Katayama, Y. Minami, J. Takeda and M. Kitajima, "Ultrafast Dynamics of the Interlayer Shearing Mode in Au Graphite Nanostructures", The 10th Conference on Lasers and Electro-Optics Pacific Rim, and The 18th OptoElectronics and Communications Conference, WPB-23 (30 June - 4 July 2013, Kyoto, Japan, Poster).

● I. Katayama, M. Bito and E. Matsubara and M. Ashida, "Near-Infrared Time-Domain Spectroscopy using Broadband Phase-locked Electromagnetic Pulses", The Conference on Lasers and Electro-Optics (CLEO/QELS 2013), MC2-4, (San Jose, USA, June 9-14, 2013, Oral).

● Y. Minami, Y. Hayashi, J. Takeda and I. Katayama, "Single-Shot Observation of THz Field with a Reflective Echelon Mirror", The Conference on Lasers and Electro-Optics (CLEO/QELS 2013), CW1K.2 (San Jose, USA, June 9-14, 2013, Oral).

● I. Katayama, Y. Ikegaya, Y. Minami and J. Takeda, "Control of Phonon Polariton Propagation in LiNbO3 Single Crystals", The Conference on Lasers and Electro-Optics (CLEO/QELS 2013), JTh2A.25 (San Jose, USA, June 9-14, 2013, Poster).

● K. Sato, I. Katayama, K. Tahara, Y. Minami, J. Takeda, K. Yanagi and M. Kitajima, "Resonant Enhancement of Coherent High-Order Phonons in Single-Walled Carbon Nanotubes", The Conference on Lasers and Electro-Optics (CLEO/QELS 2013), JTh2A.46 (San Jose, USA, June 9-14, 2013, Poster).

● T. Takizawa, I. Katayama, Y. Minami, M. Kitajima, and J. Takeda, "E-mode Phonon-Polariton Dispersion in LiNbO3 Probed via Frequency-Resolved Coherent Phonon Spectroscopy", The Conference on Lasers and Electro-Optics (CLEO/QELS 2013), JTh2A.39 (San Jose, USA, June 9-14, 2013, Poster).

● I. Katayama, K. Shudo, J. Takeda, and M. Kitajima (Invited Talk), "Nanoscale and Femtosecond Phonon Dynamics Observed with Surface Enhanced Raman Scattering", Ultrafast Surface Dynamics 2013, (May 28-31 2013, Colorado, Oral).

● J. Takeda, Y. Ikegaya, H. Sakaibara, Y. Minami and I. Katayama, "Single-Shot Time-Frequency Mapping of Coherently Controlled Phonon-Polariton Propagations in Ferroelectric LiNbO3", W5C-6, International Workshop on Optical Terahertz Science and Technology (OTST 2013), (1-5 April, Kyoto, Oral).

● Y. Minami, T. Ohshima, I. Katayama, and J. Takeda, "Observation of the asymmetric stretch mode in PtX with a broad-band THz Spectroscopy", Th3-33, International Workshop on Optical Terahertz Science and Technology (OTST 2013), (1-5 April, Kyoto).

● I. Katayama, Y. Hayashi, Y. Minami and J. Takeda, "Single-shot Detection of Terahertz Electric-Field Waveform Generated Using a Grating-coupled LiNbO3 Single Crystal", W2A-4, International Workshop on Optical Terahertz Science and Technology (OTST 2013), (1-5 April, Kyoto, Oral).

2011年

T. Satake, K. Shudo, T. Shimatsu and J. Takeda, "Spectroscopy of Electronic State of TTTA on Si(001) Surface using 2PPES and UPS", 6th International Symposium on Surface Science, 13PN-26 (Tokyo, December 11-15, 2011).

K. Shudo, K. Doi, I. Katayama, M. Kitajima and J. Takeda, "Time-resolved Measurements of Coherent Vibrations in Benzenethiol Adsorbed on Au", 6th International Symposium on Surface Science, 13aB2-4 (Tokyo, December 11-15, 2011).

K. Yokota, J. Takeda, G. Han, D. McCarthy, T. Nagao, M. Kitajima and I. Katayama, "Carrier Dynamics in Ultrathin Films of Semimetal Bismuth Studied with Terahertz Time-domain Spectroscopy", 36th International Conference on Infrared, Millimeter, and Terahertz Waves, (Houston, October 2-7, 2011).

M. Ando, M. Yazaki, I. Katayama, H. Ichida, S. Wakaiki, Y.Kanematsu, J. Takeda
"Photoluminescence Dynamics due to Biexciton and Exciton-Exciton Scattering Process in Layered-type Semiconductor PbI2"
16th International Conference on Luminescence & Optical Spectroscopy of Condensed Matter
(University of Michigan, Ann Arbor, Mi, USA June 27-July 1, 2011)

K. Satake, I. Akai, M. Kimura, I. Katayama, J. Takeda, (Best poster Awards),
"Dynamics and Efficiency of Energy Transfer in Light-harvesting π-conjugated Small Denderimers"
16th International Conference on Luminescence & Optical Spectroscopy of Condensed Matter
(University of Michigan, Ann Arbor, Mi, USA June 27-July 1, 2011)

J. Takeda, H. Sakaibara and I. Katayama（招待講演）,
"Real-Time Mapping of The Phonon-Polariton Dispersion in Ferroelectric LiNbO3 Using Femtosecond Single-Shot Imaging Spectroscopy",
5th International Conference on Science and Technology for Advanced Ceramics, 22pHsI02 (Yokohama, Japan, June 22-24, 2011).

I. Katayama, J. Takeda, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Nagai and K. Tanaka,
"Ferroelectric Polarization in SrTiO3 Thin Film Driven by Intense Terahertz Pulses",
5th International Conference on Science and Technology for Advanced Ceramics, 22aFjO05 (Yokohama, Japan, June 22-24, 2011).

S. Koga, K. Tahara, I. Katayama, K. Shudo, J. Takeda, T. Shimada and M. Kitajima,
"Dynamics of Coherent Phonons in Carbon Materials",
5th International Conference on Science and Technology for Advanced Ceramics, 22pHsO03 (Yokohama, Japan, June 22-24, 2011).

T. Eda, H. Koguchi, H. Takahashi, I. Katayama, J. Takada, Y. Kamihara, M. Kitajima and K. G. Nakamura (Best poster Awards),
"Coherent Optical Phonons in SmFeAsO1-XFX (X=0.075)",
5th International Conference on Science and Technology for Advanced Ceramics, 22pP060 (Yokohama, Japan, June 22-24, 2011).

I. Katayama, H. Aoki, J. Takeda, H. Shimosato, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Nagai and K. Tanaka,

"Direct Observation of the Soft-Mode Anharmonicity in SrTiO3",
International Conference on Luminescence (ICL'11), WP102 (Ann Arbor, USA, June 26-July 1, 2011).

I. Katayama, M. Bito, R. Akai, H. Shimosato, K. Miyamoto, H. Ito, and M. Ashida
"Phase matching condition for ultrabroadband terahertz generation in a DAST Single Crystal"
The 16th International Workshop on Optical Terahertz Science and Technology 2011 (Santa Barbara, USA, Mar. 2011, WC1, Oral).

I. Katayama, H. Shimosato, M. Bito, K. Furusawa, M. Adachi, M.Shimada, H. Zen, S. Kimura, N. Yamamoto, M. Hosaka, M. Katoh, and M. Ashida
"Terahertz Coherent Synchrotron Radiation Probed with Electro-Optic Sampling Method"
The 14th International Workshop on Optical Terahertz Science and Technology 2011 (Santa Barbara, USA, Mar. 2011, Poster).

2010年

J. Takeda, H. Sakaibara and I. Katayama
"Single-Shot Time-Frequency Two-Dimensional Imaging for Irreversible Photoinduced Processes"
3rd Japanese-French Joint Seminar on Organic Photochromism (Yokohama, Japan, October 21-22, 2010).

I. Katayama, H. Shimosato, M. Bito, K. Furusawa, M. Adachi, H. Zen, M. Shimada, N. Yamamoto, M. Hosaka, S. Kimura, M. Kato, and M. Ashida（招待講演)
"Coherent Synchrotron Terahertz Radiation using Laser Bunch Slicing"
35th International Conference on Infrared, Millimeter, and Terahertz Waves, (Rome, Sep. 7, 2010, Tu-F1).

T. Kawano, I. Katayama, T. Shin, J. Wolfson, K. A. Nelson and J. Takeda
"Ultrafast Photoinduced Phase Conversion to a Metallic State in Quasi-One-dimensional Platinum Complexes under Extremely High-Density Excitation"
17th International Conference on Ultrafast Phenomena, (Snowmass Village, USA, July 18-23, 2010).

I. Katayama, S. Koga, T. Shimada, K. Kato, S. Hishita, D. Fujita, J. Takeda and M. Kitajima
"Dynamics of Coherent Phonons in Disordered Graphite"
17th International Conference on Ultrafast Phenomena, (Snowmass Village, USA, July 18-23, 2010).

S. Koga, I. Katayama, J. Takeda, T. Shimada, S. Hishita, D. Fujita, and M. Kitajima
"Enhancement of Coherent D-Mode Phonons in Highly-Oriented Pyrolytic Graphite"
SSSJ-A3 Foresight Joint Symposium on Nanomaterials and Nanostructures, (Tokyo, Japan, July 6, 2010).

N. Niimura, I. Katayama, T. Inada and J. Takeda
"Optical Response and Function Control of Protein with Photochromic Materials"
International Conference on Science and Technology of Synthetic Metals 2010, (Kyoto, Japan, July 4-9, 2010).

Y. Nagayoshi, K. Satake, I. Akai, M. Kimura, I. Katayama and J. Takeda
"Energy Transfer Efficiency from Light-Harvesting Antennas to The Core in -Conjugated Small Dendrimers"
International Conference on Science and Technology of Synthetic Metals 2010, (Kyoto, Japan, July 4-9, 2010).

T. Takeuchi, M. Mitarai, I. Katayama and J. Takeda
"Phase Transition Dynamics Probed with Photoluminescence due to Self-Trapped Excitons in an Organic Radical TTTA Crystal"
International Conference on Science and Technology of Synthetic Metals 2010, (Kyoto, Japan, July 4-9, 2010).

J. Takeda, A. Ishida, and I. Katayama（招待講演）
"Real-Time Time-Frequency Two-Dimensional Imaging of Ultrafast Excited-State Dynamics in Light-Harvesting Nano- and Biomaterials"
International Conference on Nanomaterials: Synthesis Characterization and Applications (ICN2010), (India, April 27-29, 2010).

I. Katayama, S. Koga, J. Takeda, T. Shimada, S. Hishida, D. Fujita and M. Kitajima
"Surface plasmon enhancement of coherent phonons in an ionimplanted graphite"
The International Conference on Nanophotonics 2010, (Tsukuba, Japan, May 30 - June 3, 2010).

I. Katayama, H. Aoki, J. Takeda, H. Shimosato, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Nagai and K. Tanaka（招待講演）
"Nonlinear THz Spectroscopy on the Dielectric Thin Films"
The Conference on Lasers and Electro-Optics (CLEO/QELS2010), (San Jose, USA, May 16-21, 2010).

H. Sakaibara, I. Katayama and J. Takeda
"Time-Frequency Real-Time Imaging of Ultrashort Laser Pulses with a Single Echelon Mirror"
The Conference on Lasers and Electro-Optics (CLEO/QELS2010), (San Jose, USA, May 16-21, 2010).

2005-2009

2009年

2008年

I. Katayama, K. Mitarai and J. Takeda,
"Precursor of Two-Photon Induced Phase Transition in Organic Radical TTTA Crystals",
The 3rd International Conference on Photo-Induced Phase Transitions and Cooperative Phenomena (Osaka, Japan, November 11-15, 2008).

J. Takeda, Y. Makishima, A. Ishida, A. Yamada and I. Katayama,
"Real-Time Time-Frequency Two-Dimensional Mapping of Ultrafast Excited-State Dynamics and Energy Flow in Biomaterials",
The 3rd International Conference on Photo-Induced Phase Transitions and Cooperative Phenomena (Osaka, Japan, November 11-15, 2008).

I. Katayama, K. Mitarai, T. Kon, and J. Takeda,
"Photoinduced Phase Transition in Strongly Correlated TTTA Crystals Probed with Two-Photon Luminescence",
The 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (Lyon, France, July 7-July11, 2008).

A. Yamada, A. Ishida, I. Akai, M. Kimura, I. Katayama and J. Takeda,
"Energy transfer dynamics in light-harvesting small dendrimers studied by time-frequency two-dimensional imaging spectroscopy ",
The 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (Lyon, France, July 7-July11, 2008).

I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto,
T. Karasawa, A. Ishida, A. Yamada, I. Katayama, J. Takeda and M. Kimura,
"Rapid Energy Transfer and its Temperature dependence in π-Conjugated Dendrimers",
The 8th International Conference on Excitonic Processes in Condensed Matter (Kyoto, Japan, June 22- June 27, 2008).

S. Mitsubori, S. H. Lee, T. Yao, I. Katayama and J. Takeda,
"Ultrafast Dynamics of High-Density Carriers in ZnO Nano-Multipods Studied by Femtosecond Optical Spectroscopy",
The 8th International Conference on Excitonic Processes in Condensed Matter (Kyoto, Japan, June 22- June 27, 2008).

J. Takeda, Y. Makishima, A. Ishida, A. Yamada and I. Katayama,
"Real-Time Time-Frequency Two-Dimensional Visualization of Ultrafast Excited-State Dynamics in Biomaterials",
International Conference on Quantum Simulators and Design 2008,
(Tokyo, Japan, May 31- June 3, 2008).

S. Mitsubori, I. Katayama, Sang Hyun Lee, Takafumi Yao and J. Takeda,
"Ultrafast Lasing due to Electron-Hole Plasma in ZnO Nano-Multipods"
International Conference on Quantum Simulators and Design 2008,
(Tokyo, Japan, May 31- June 3, 2008).

T. Kawano, I. Katayama, K. Shudo, K. Ohno, and J. Takeda,
"PUMP-PROBE SPECTROSCOPY AND ELECTRONIC STATE CALCULATION OF STRONGLY-CORRELATED ORGANIC RADICAL
TTTA "
International Conference on Quantum Simulators and Design 2008,
(Tokyo, Japan, May 31- June 3, 2008).

2007年

A. Ishida, Y. Makishima, A. Okada, I. Akai, K. Kanemoto, T. Karasawa, M. Kimura and J. Takeda,
"Time-Frequency Two-Dimensional Mapping of Rapid Energy Transfer in Light-Harvesting Star-Shaped Dendrimers",
The 16th International Conference on Dynamical processes in Excited States of Solids, Segovia, Spain, June 17-22, 2007.

H. Suzuki, S. Oguri, T. Kon, T. Yokoi, S. Ishii, K. Ohno and J. Takeda,
"Luminescence Properties and Relaxation Processes of Strongly Correlated Organic Radical TTTA Crystals and Molecules",　
The 16th International Conference on Dynamical processes in Excited States of Solids, Segovia, Spain, June 17-22, 2007.

T. Kon, S. Oguri and J. Takeda,
"Photoluminescence and Photoinduced Magnetic Phase Transition in an Organic Radical TTTA Crystal Studied by Two-Photon Absorption",
The 16th International Conference on Dynamical processes in Excited States of Solids, Segovia, Spain, June 17-22, 2007.

2006年

K. Ohno, Y. Noguchi, T. Yokoi, S. Ishii and J. Takeda,
"Significant Reduction of On-site Coulomb Energy U due to Short-Range Correlations in an Organic Mott Insulator",
(invited paper), International Workshop on First Principle Calculation of Correlated Electrons (Koshiba Hall, Tokyo, Nov. 30 - Dec. 1, 2006).

J. Takeda, Y. Makishima and A. Ishida,
"Time- and Frequency-Resolved Two-Dimensional Transient Absorption Imaging of b-carotene in Solids",
15th International Conference on Ultrafast Phenomena, (Pacific Grove, California, USA, July 31- August 4, 2006).

2005年

・Y. Takahashi, T. Suemoto, S. Oguri and J. Takeda
"The femtosecond luminescence dynamics in the photo-induced phase transition material TTTA",
The 3rd International Workshop on Frontiers of Laser and Optical Sciences, (Hongo, Tokyo, October 1-2, 2005).

・Y. Makishima, N. Furukawa and J. Takeda,
"Femtosecond real-time pump-probe imaging spectroscopy implemented on a single shot basis",
The 15th International Conference on Dynamical processes in Excited States of Solids, Shanghai, China, August 1-5, 2005.

・T. Hosoya, K. Tanaka, R. Fukaya and J. Takeda,
"Dynamics of high-density excitons in PbI2 studied by two-photon absorption",
The 15th International Conference on Dynamical processes in Excited States of Solids,Shanghai, China, August 1-5, 2005.

・N. Arai, J. Takeda, H-J. Ko and T. Yao,
"Dynamics of High-Density Excitons and Electron-Hole Plasma in ZnO Epitaxial Thin Films",
The 15th International Conference on Dynamical processes in Excited States of Solids, Shanghai, China, August 1-5, 2005.

・K. Tanaka, T. Hosoya, R. Fukaya and J. Takeda,
"A New Luminescence due to an Exciton-Exciton Collision Process in Lead Iodide Induced by Two-Photon Absorption",
14th International Conference on Luminescence, Beijing, China, July 25-29, 2005.

・Y. Takahashi, T. Suemoto, S. Oguri and J. Takeda,
"Excited State Dynamics of TTTA Studied by Femtosecond Luminescence Spectroscopy",
14th International Conference on Luminescence Beijing, China, July 25-29, 2005.

・S. Oguri, J. Takeda, S. Inoue and T. Kodaira
"Diamagnetic to Paramagnetic Phase Transition in an Organic Radical TTTA Crystal Induced by Two-Photon Excitation",
International Quantum Electronics Conference 2005 and the Pacific Rim Conference on Lasers and Electro-Optics 2005 (IQEC/CLEO-PR 2005), Toshi Center Kaikan, Tokyo, Japan, July 11-15, 2005.

2000-2004

2004年

・ N. Furukawa, C. E. Mair, V. D. Kleiman and J. Takeda
　"Direct visualization of transient absorption by real-time pump-probe imaging spectroscopy",
14th International Conference on Ultrafast Phenomena, Toki Messe Convention Center,Niigata, July 25-30, 2004.

・ S. Oguri, O. Hanado, J. Takeda, M. Furuya, K. Ohno, S. Inoue and T. Kodaira
　"Photoinduced diamagnetic to paramagnetic phase transition in an organic radical crystal studied by microscopic IR measurements",
6th International Conference on Excitonic Processes in Condensed Matter (EXCON'04), Cracow, July 6-9, 2004.

2003年

・ M. Furuya, K. Ohno, J. Takeda and Y. Kawazoe
　"Electronic Structure Calculation of the TTTA molecular Crystal",
IUMRS-ICAM2003, (Yokohama, 8-13 October, 2003).

・ M. Furuya, K. Ohno, T. Morisato, Y. Kawazoe and J. Takeda
　"Band Structure Calculation of TTTA Crystal",
Trans. Mater. Res. Soc. Jpn,. 28, pp. 911-914 (2003).

・ Y. Toshine, J. Takeda, H.J. Ko, T. Yao
　"Conversion of Electron-Hole Plasma to High Density Excitonic State in ZnO Epitaxial Thin Films"
11th International Conference on II-VI Compounds, Holiday Inn Select, Niagara Falls, New York, September 22-26, 2003.

・J. Takeda, K.Takagi, T. Okabe, H. J. Ko and T. Yao
"Relaxation and Diffusion of Photoexcited Carriers in ZnO Epitaxial Thin Films"
11th International Conference on II-VI Compounds, Holiday Inn Select, Niagara Falls, New York, September 22-26, 2003

2002年

・ J. Takeda
"Femtosecond Dynamics of Photoexcited High Density Carriers in ZnO Epitaxial Thin Films",
(招待講演), 5th International Conference on Excitonic Processes in Condensed Matter (Excon02), (Darwin, 22-26 July, 2002).

・ N. Furukawa and J. Takeda,
"Ultrafast internal conversion of all-trans-b-carotene studied by femtosecond spectroscopy",
5th International Conference on Excitonic Processes in Condensed Matter (Excon02), (Darwin, 22-26 July, 2002).

・ K. Takagi, Y. Toshine, J. Takeda, S. Kurita, Y. F. Chen and T. Yao,
"Evolution of Electron-Hole Plasma and Excitons in ZnO Epitaxial Thin Films Studied by Femtosecond Spectroscopy",
5th International Conference on Excitonic Processes in Condensed Matter (Excon02), (Darwin, 22-26 July, 2002).

・ T. Matsuoka, S. Saito, J. Takeda, S. Kurita and T. Suemoto,
"Overtone Modulation and Anti-Phasing Behavior of Wave-Packet Amplitudes on the Adiabatic Potential Surface of Self-Trapped Excitons",
5th International Conference on Excitonic Processes in Condensed Matter (Excon02), (Darwin, 22-26 July, 2002).

2001年

・ S. Tomimoto, S. Saito, T. Suemoto, J. Takeda and S. Kurita,
"Femtosecond Relaxation Dynamics of Excitons in 1D CDW Systems",
2001 International Conference on Dynamical Processes in Excited States of Solids, (Lyon, 1-4 July, 2001).

・ J. Takeda, H. Jinnouchi, S. Kurita, Y. F. Chen and T. Yao,
"Dynamics of Photoexcited High Density Carriers in ZnO Epitaxial Thin Films",
The Tenth International Conference on II-VI Compounds, (Bremen, 9-14 September, 2001).

・ J. Takeda, M. Imae, S. Kurita and T. Kodaira,
"Thermochromism and Magnetic Phase Transition in an Organic Radical 1,3,5-Trithia-2,4,6-triazapentalenyl ",
International Conference on Phtoinduced Phase Transitions, their Dynamics and Precursor Phenomena, (Tukuba, 14-16 November, 2001).

2000年

・ J. Takeda, T. Sakamoto, T. Arai and S. Kurita,
"Exciton dynamics of orthorhombic phase PbI2 embedded in PbI2-PbBr2 Mixed Crystals",
International Conference on Excitonic Processes in Condensed Matter, (Osaka, 22-25 August, 2000).

・ J. Takeda, S. Kurita, Y. F. Chen and T. Yao,
"Ultrafast Carrier Dynamics in ZnO Epitaxial Thin Films Studied by Optical Kerr Gate Luminescence Spectroscopy",
International Conference on Excitonic Processes in Condensed Matter, (Osaka, 22-25 August, 2000).

・ S. Tomimoto, S. Saito, T. Suemoto, K. Sakata, J. Takeda and S. Kurita,
"Bridging-Halogen Dependence of Ultrafast Dynamics of Excitons in Quasi-One-Dimensional Platinum Complexes",
International Conference on Excitonic Processes in Condensed Matter, (Osaka, 22-25 August, 2000).

・ J. Takeda, H. Jinnouchi, S. Kurita, Y. F. Chen and T. Yao,
"Dynamical Properties of Electron-hole Plasma in ZnO Epitaxial Thin Films Studied by Optical Kerr Gate Luminescence Spectroscopy",
25th International Conference on the Physics of Semiconductors, (Osaka, 17-22 September, 2000).