Amplified emission and lasing in photonic time crystals

被引：136
作者：
Lyubarov, Mark [1 ,2 ,3 ]
Lumer, Yaakov [1 ,2 ]
Dikopoltsev, Alex [1 ,2 ]
Lustig, Eran [1 ,2 ]
Sharabi, Yonatan [1 ,2 ]
Segev, Mordechai [1 ,2 ,4 ]
机构：
[1] Technion Israel Inst Technol, Phys Dept, IL-32000 Haifa, Israel
[2] Technion Israel Inst Technol, Solid State Inst, IL-32000 Haifa, Israel
[3] ITMO Univ, Phys & Engn Dept, St Petersburg 197101, Russia
[4] Technion Israel Inst Technol, Dept Elect & Comp Engn, IL-32000 Haifa, Israel
来源：
SCIENCE | 2022年 / 377卷 / 6604期
关键词：
REVERSAL; REFRACTION; DEFECT;
D O I：
10.1126/science.abo3324
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), materials with a dielectric permittivity that is modulated periodically in time, offer new concepts in light manipulation. We study theoretically the emission of light from a radiation source placed inside a PTC and find that radiation corresponding to the momentum bandgap is exponentially amplified, whether initiated by a macroscopic source, an atom, or vacuum fluctuations, drawing the amplification energy from the modulation. The radiation linewidth becomes narrower with time, eventually becoming monochromatic in the middle of the bandgap, which enables us to propose the concept of nonresonant tunable PTC laser. Finally, we find that the spontaneous decay rate of an atom embedded in a PTC vanishes at the band edge because of the low density of photonic states.
引用
收藏
页码：425 / +
页数：4
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