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High-efficiency generation of circularly polarized light via symmetry-induced anomalous reflection

2015; American Physical Society; Volume: 91; Issue: 12 Linguagem: Inglês

10.1103/physrevb.91.125421

1550-235X

Shang‐Chi Jiang, Xiang Xiong, Yuan-Sheng Hu, Shengwei Jiang, Yuhui Hu, Di‐Hu Xu, Ru‐Wen Peng, Mu Wang,

Photonic Crystals and Applications

Great efforts have been devoted to control the polarization state, the transmission direction, and the phase of light within a very confined space in recent decades. Here, we present a two-dimensional metastructure made of an array of unisized split rings with different opening orientations on the surface of a $\mathrm{Si}{\mathrm{O}}_{2}$-silver bilayer. This structure possesses an unexpectedly high polarization conversion ratio and generates significantly strong anomalous reflection beams (over 70% of incident light intensity) over a broad frequency range (1100--1750 nm). Functionally, it is able to turn either a linearly polarized incident light or natural light into two perfect circularly polarized beams with the same amplitude yet different handedness to different directions. These features demonstrate a clear example of momentum conservation and can be applied to detect/manipulate the propagation of circularly polarized light.