ニュース＆トピックス
セミナーのお知らせ: Peter Hommelhoff 氏 (Professor, Physics Department, Friedrich-Alexander University, Erlangen, Germany/ Faculty of Physics, Ludwig-Maximilian University, Munich, Germany)
以下のとおりセミナーを開催いたします。皆様のご参加をお待ちしています。
UTriplセミナー
・ALICeセミナー
GMSIセミナー
・WINGS CFSセミナー
TACMIコンソーシアムオープンセミナー
日時：２０２５年４月１０日（木）10:00～11:30
場所：東京大学理学部1号館913号室 および ZOOM（どちらも事前登録制）
講演者： Peter Hommelhoff 氏
(Professor, Physics Department, Friedrich-Alexander University, Erlangen, Germany/ Faculty of Physics, Ludwig-Maximilian University, Munich, Germany)
講演題目: Ultrafast control over electrons - in free space beams, inside of matter and at needle tips
Abstract
Optical fields and electrons can be efficiently coupled. We show three experiments in which we could gain new insights and reach new levels of electron control by focusing ultrashort, often phase-controlled few-cycle pulses at (1) photonic nanostructures for electron acceleration, (2) graphene and (3) sharp needle tips. (1) With properly designed quasi-periodic nanostructures, we could demonstrate complex electron phase space control at optical frequencies. This allowed us to guide and accelerate electron bunches through the 225nm narrow channel of a 500µm long nanophotonic accelerator structure, obtaining an energy increase from 28 to 40 keV. (2) In graphene and at the graphene-gold interface, we could demonstrate strongfield coherent electron dynamics, allowing us to show a first logic gate potentially operating at petahertz frequencies. (3) At sharp needle tips, we can now perform precision attosecond physics measurements. For example, we measured the electron emission with an error bar as small as 30 attoseconds. Last, I will show chip-based guiding of electrons, resulting in novel low-energy electron resonators.
使用言語：English/英語
紹介教員：坂上 和之
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