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セミナーのお知らせ: Dr. Thibault J.-Y. Derrien (Senior Researcher, HiLASE Centre, Institute of Physics)
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日時：2019年6月19日（水）13:00～14:30 / Date & Time : 13:00-14:30 on Wednesday, June 19, 2019
場所：東京大学本郷キャンパス
工学部３号館２階３２号講義室
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Venue : Lecture Room 32, 2F Engineering Bldg. #3
Speaker： Dr. Thibault J.-Y. Derrien
(Senior Researcher, HiLASE Centre, Institute of Physics)
Title : Predictive modeling of materials excitation, melting and nanostructuring upon femtosecond laser irradiation:
first-principle and phenomenological perspectives
Abstract
Irradiating solids using near-IR and intense ultrashort laser pulses is triggering a wide variety of microscopic and large-scale phenomena, from the attosecond excitation of electrons to the microsecond cooling of the sample. In this seminar, examples of macroscopic manifestations of laser-triggered quantum phenomena relevant to the field of laser processing will be discussed, supported by first-principle and by large-scale simulations.
A first example is the formation of periodic nanostructures induced by the laser-excitation of polaritons at the surface of metals and band gap solids undergoing transient metallization. In particular, improving the description of optical losses in classical polaritonics has enabled a better control of surface polaritons properties and lifetime.
A second example is the analysis of macroscopic pump-probe experiments made with semiconductors, where carrier diffusion and 3-body-phenomena such as Auger recombination and screening of the electron-phonon interaction at high electron density plays a role in localization of the absorbed laser energy. Phenomenological descriptions enable to perform accurate predictions of material melting thresholds on a wide range of laser parameters and reveal sub-surface dynamics originating from the density-dependent electron-phonon coupling.
使用言語：英語 / Language : English
紹介教員：石川顕一 教授 (工学系研究科原子力国際専攻)
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