Spin-preserving chiral photonic crystal mirror

圆二色性 光子晶体 物理 光学 手性(物理) 超材料 导模共振 二色性 磁圆二色性 圆极化 光电子学 对称性破坏 化学 栅栏 量子力学 结晶学 衍射光栅 谱线 微带线 手征对称破缺 Nambu–Jona Lasinio模型
作者
Behrooz Semnani,Jeremy Flannery,Rubayet Al Maruf,Michal Bajcsy
出处
期刊:Light-Science & Applications [Springer Nature]
卷期号:9 (1) 被引量:64
标识
DOI:10.1038/s41377-020-0256-5
摘要

Chirality refers to a geometric phenomenon in which objects are not superimposable on their mirror image. Structures made of nanoscale chiral elements can exhibit chiroptical effects, such as dichroism for left- and right-handed circularly polarized light, which makes these structures highly suitable for applications ranging from quantum information processing and quantum optics to circular dichroism spectroscopy and molecular recognition. At the same time, strong chiroptical effects have been challenging to achieve even in synthetic optical media, and chiroptical effects for light with normal incidence have been speculated to be prohibited in thin, lossless quasi-two-dimensional structures. Here, we report an experimental realization of a giant chiroptical effect in a thin monolithic photonic crystal mirror. Unlike conventional mirrors, our mirror selectively reflects only one spin state of light while preserving its handedness, with a near-unity level of circular dichroism. The operational principle of the photonic crystal mirror relies on guided-mode resonance (GMR) with a simultaneous excitation of leaky transverse electric (TE-like) and transverse magnetic (TM-like) Bloch modes in the photonic crystal slab. Such modes are not reliant on the suppression of radiative losses through long-range destructive interference, and even small areas of the photonic crystal exhibit robust circular dichroism. Despite its simplicity, the mirror strongly outperforms earlier reported structures and, contrary to a prevailing notion, demonstrates that near-unity reflectivity contrast for opposite helicities is achievable in a quasi-two-dimensional structure.
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