Observation of valley-dependent beams in photonic graphene

被引：40
|
作者：
Deng, Fusheng [1 ,2 ]
Sun, Yong [1 ]
Wang, Xiao [1 ]
Xue, Rui [1 ]
Li, Yuan [1 ]
Jiang, Haitao [1 ]
Shi, Yunlong [1 ,2 ]
Chang, Kai [3 ]
Chen, Hong [1 ]
机构：
[1] Tongji Univ, Sch Phys Sci & Engn, MOE Key Lab Adv Microstructured Mat, Shanghai 200092, Peoples R China
[2] Shanxi Datong Univ, Inst Solid State Phys, Datong, Peoples R China
[3] Chinese Acad Sci, Inst Semicond, SKLSM, Beijing 100083, Peoples R China
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 19期
基金：
中国国家自然科学基金;
关键词：
TRANSMISSION; POLARIZATION; MOS2;
D O I：
10.1364/OE.22.023605
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Valley-dependent propagation of light in an artificial photonic hexagonal lattice, akin to electrons in graphene, is investigated in microwave regime. Both numerical and experimental results show that the valley degeneracy in the photonic graphene is broken when the frequency is away from the Dirac point. The peculiar anisotropic wave transport property due to distinct valleys is analyzed using the equifrequency contours. More interestingly, the valley-dependent self-collimation and beam splitting phenomena are experimentally demonstrated with the armchair and zigzag interfaces, respectively. Our results confirm that there are two inequivalent Dirac points that lead to two distinct valleys in photonic graphene, which could be used to control the flow of light and might be used to carry information in valley polarized beam splitter, collimator or guiding device. (C) 2014 Optical Society of America
引用
收藏
页码：23605 / 23613
页数：9
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