Light emission by free electrons in photonic time-crystals

被引：59

作者：

Dikopoltsev, Alex ^{[1
]}

Sharabi, Yonatan ^{[1
]}

Lyubarov, Mark ^{[1
]}

Lumer, Yaakov ^{[1
]}

Tsesses, Shai ^{[2
]}

Lustig, Eran ^{[1
]}

Kaminer, Ido ^{[2
]}

Segev, Mordechai ^{[1
,2
]}

机构：

[1] Technion Israel Inst Technol, Phys Dept, IL-32000 Haifa, Israel

[2] Technion Israel Inst Technol, Electr Engn Dept, IL-32000 Haifa, Israel

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2022年 / 119卷 / 06期

关键词：

photonics; ultrafast optics; photonic crystals; lasers; RADIATION; FIELD;

D O I：

10.1073/pnas.2119705119

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Photonic time-crystals (PTCs) are spatially homogeneous media whose electromagnetic susceptibility varies periodically in time, causing temporal reflections and refractions for any wave propagating within the medium. The time-reflected and time-refracted waves interfere, giving rise to Floquet modes with momentum bands separated by momentum gaps (rather than energy bands and energy gaps, as in photonic crystals). Here, we present a study on the emission of radiation by free electrons in PTCs. We show that a free electron moving in a PTC spontaneously emits radiation, and when associated with momentum-gap modes, the electron emission process is exponentially amplified by the modulation of the refractive index. Moreover, under strong electron-photon coupling, the quantum formulation reveals that the spontaneous emission into the PTC bandgap experiences destructive quantum interference with the emission of the electron into the PTC band modes, leading to suppression of the interdependent emission. Free-electron physics in PTCs offers a platform for studying a plethora of exciting phenomena, such as radiating dipoles moving at relativistic speeds and highly efficient quantum interactions with free electrons.

引用

页数：7

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