Analytical study of mode degeneracy in non-Hermitian photonic crystals   with TM-like polarization

doi:10.1103/PhysRevB.96.075111

CORC > 北京大学 > 信息科学技术学院

	Analytical study of mode degeneracy in non-Hermitian photonic crystals with TM-like polarization
	Yin, Xuefan ; Liang, Yong ; Ni, Liangfu ; Wang, Zhixin ; Peng, Chao ; Li, Zhengbin
刊名	PHYSICAL REVIEW B
	2017
关键词	SURFACE-EMITTING LASERS COUPLED-WAVE ANALYSIS TRANSVERSE-ELECTRIC POLARIZATION ZERO-INDEX METAMATERIALS DIRAC CONES TRANSMISSION LATTICE CHIP NANOCAVITY GUIDES
DOI	10.1103/PhysRevB.96.075111
英文摘要	We present a study of the mode degeneracy in non-Hermitian photonic crystals (PC) with TM-like polarization and C-4v symmetry from the perspective of the coupled-wave theory (CWT). The CWT framework is extended to include TE-TM coupling terms which are critical for modeling the accidental triple degeneracy within non-Hermitian PC systems. We derive the analytical form of the wave function and the condition of Dirac-like-cone dispersion when radiation loss is relatively small. We find that, similar to a real Dirac cone, the Dirac-like cone in non-Hermitian PCs possesses good linearity and isotropy, even with a ring of exceptional points (EPs) inevitably existing in the vicinity of the second-order Gamma point. However, the Berry phase remains zero at the Gamma point, indicating the cone does not obey the Dirac equation and is only a Dirac-like cone. The topological modal interchange phenomenon and nonzero Berry phase of the EPs are also discussed.; National Natural Science Foundation of China [61320106001, 61575002]; State Key Laboratory of Advanced Optical Communication Systems and Networks, China; ETH Zurich Postdoctoral Fellowship Program [FEL-27 14-2]; SCI(E); ARTICLE; 7; 96
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471574]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Yin, Xuefan,Liang, Yong,Ni, Liangfu,et al. Analytical study of mode degeneracy in non-Hermitian photonic crystals with TM-like polarization[J]. PHYSICAL REVIEW B,2017.
APA	Yin, Xuefan,Liang, Yong,Ni, Liangfu,Wang, Zhixin,Peng, Chao,&Li, Zhengbin.(2017).Analytical study of mode degeneracy in non-Hermitian photonic crystals with TM-like polarization.PHYSICAL REVIEW B.
MLA	Yin, Xuefan,et al."Analytical study of mode degeneracy in non-Hermitian photonic crystals with TM-like polarization".PHYSICAL REVIEW B (2017).