Spatiotemporal photonic crystals

被引:60
作者
Sharabi, Yonatan [1 ]
Lustig, Eran [1 ]
Dikopoltsev, Alex [1 ]
Lumer, Yaakov [1 ]
Segev, Moti [1 ]
机构
[1] Technion Israel Inst Technol, Solid State Inst, IL-32000 Haifa, Israel
关键词
All Open Access; Gold;
D O I
10.1364/OPTICA.455672
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We study light propagation in spatiotemporal photonic crystals: dielectric media that vary periodically in both space and time. While photonic crystals (spatially periodic media) are well understood, the combination of periodic change in both time and space poses considerable challenges and requires new analysis methods. We find that the band structure of such systems contains energy gaps, momentum gaps, and mixed energy-momentum gaps in which both energy and momentum may attain complex values. We identify the unique interplay between the exponential growth induced by temporal modulation and the exponential decay caused by spatial modulation, and how these can completely counteract one another. Under proper conditions, these two opposing forces are exactly matched, causing the mixed energy-momentum gap to collapse to a single point, which is an exceptional point known from non-Hermitian dynamics. Such spatiotemporal photonic crystals possess unique properties that could pave the way to new ways of controlling the propagation of light. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码:585 / 592
页数:8
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