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Arbitrary polarization-independent backscattering or reflection by rotationally symmetric reciprocal structures
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论文类型：期刊论文
发表刊物：Physical Review B
所属单位：光电学院，国家光电研究中心
刊物所在地：美国
学科门类：物理学
项目来源：自然科学基金
文献类型：J
卷号：103
期号：4
关键字：无
DOI码：10.1103/PhysRevB.103.045422
发表时间：2021-01-08
教研室：c716
摘要：We study the backward scatterings of plane waves by reciprocal scatterers and reveal that n-fold (n≥3) rotation symmetry is sufficient to secure invariant backscattering for arbitrarily polarized incident plane waves. It is further demonstrated that the same principle is also applicable for infinite periodic structures in terms of reflection, which simultaneously guarantees the transmission invariance if there are neither Ohmic losses nor extra diffraction channels. In the presence of losses, extra reflection symmetries (with reflection planes either parallel or perpendicular to the incident direction) can be incorporated to ensure simultaneously the invariance of transmission and absorption. The principles we have revealed are protected by fundamental laws of reciprocity and parity conservation, which are fully independent of the optical or geometric parameters of the photonic structures. The optical invariance obtained is intrinsically robust against perturbations that preserve reciprocity and the geometric symmetries, which could be widely employed for photonic applications that require stable backscatterings or reflections.
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