High-efficiency broadband anomalous reflection by gradient meta-surfaces

Shulin Sun, Kuang Yu Yang, Chih Ming Wang, Ta Ko Juan, Wei Ting Chen, Chun Yen Liao, Qiong He, Shiyi Xiao, Wen Ting Kung, Guang Yu Guo, Lei Zhou, Din Ping Tsai

研究成果: 雜誌貢獻期刊論文同行評審

1145 引文 斯高帕斯(Scopus)


We combine theory and experiment to demonstrate that a carefully designed gradient meta-surface supports high-efficiency anomalous reflections for near-infrared light following the generalized Snells law, and the reflected wave becomes a bounded surface wave as the incident angle exceeds a critical value. Compared to previously fabricated gradient meta-surfaces in infrared regime, our samples work in a shorter wavelength regime with a broad bandwidth (750-900 nm), exhibit a much higher conversion efficiency (∼80%) to the anomalous reflection mode at normal incidence, and keep light polarization unchanged after the anomalous reflection. Finite-difference-time-domain (FDTD) simulations are in excellent agreement with experiments. Our findings may lead to many interesting applications, such as antireflection coating, polarization and spectral beam splitters, high-efficiency light absorbers, and surface plasmon couplers.

頁(從 - 到)6223-6229
期刊Nano Letters
出版狀態已出版 - 12 12月 2012


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