From topologically protected coherent perfect reflection to bound states in the continuum

被引：47

作者：

Dai, Shiwei ^{[1
]}

Liu, Liang ^{[1
]}

Han, Dezhuan ^{[1
]}

Zi, Jian ^{[2
,3
]}

机构：

[1] Chongqing Univ, Dept Appl Phys, Chongqing 401331, Peoples R China

[2] Fudan Univ, Dept Phys, Key Lab Micro & Nanophoton Struct MOE, Shanghai 200433, Peoples R China

[3] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 08期

基金：

中国国家自然科学基金;

关键词：

WAVES; RESONANCES; PHOTONS; LIGHT;

D O I：

10.1103/PhysRevB.98.081405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A mechanism for perfect reflection is proposed for the dielectric medium beyond the total internal reflection and band gaps. It arises from the coherence of multiple propagating modes, and can be determined by the topological vortex of a transmission coefficient with a nonzero winding number in parameter space. Based on the coherent perfect reflection, a generalized waveguide condition is derived analytically. In a photonic crystal slab, the modes that satisfy this condition are precisely bound states in the continuum. Our findings may have many potential applications in guided-wave optics.

引用

页数：5

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