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

Research output: Contribution to journalArticlepeer-review

1209 Scopus citations


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.

Original languageEnglish
Pages (from-to)6223-6229
Number of pages7
JournalNano Letters
Issue number12
StatePublished - 12 Dec 2012


  • Metamaterials
  • generalized Snells law
  • gradient meta-surfaces
  • high impedance surface
  • reflection phase
  • surface waves


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