Band structure and topological phase transition of photonic time crystals

被引：12
|
作者：
Ma, Ji [1 ]
Wang, Zhi-Guo [1 ]
机构：
[1] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China
来源：
OPTICS EXPRESS | 2019年 / 27卷 / 09期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
MODULATION;
D O I：
10.1364/OE.27.012914
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate the band structure and topological phase transition of photonic time crystals (PTC)-systems in which the physical parameter varies periodically in time. We find that the topological phase transition of the PTC system can be revealed by the wave vector gap (k-gap) size, which was induced by the temporal refraction and reflection. Interestingly, a temporal zero-averaged refractive index k-gap is obtained when the PTC system includes a dispersive medium. This special k-gap is invariant with modulation time scaling at a given modulation frequency. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：12914 / 12922
页数：9
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