Bilayer metasurfaces for dual-and broadband optical antireflection

Li Huang*, Chun Chieh Chang, Beibei Zeng, John Nogan, Sheng Nian Luo, Antoinette J. Taylor, Abul K. Azad, Hou Tong Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Optical antireflection has long been pursued for a wide range of applications, but existing approaches encounter issues in the performance, bandwidth, and structure complexity, particularly in the long-wavelength infrared regime. Here we present the demonstration of bilayer metasurfaces that accomplish dual-and broadband optical antireflection in the terahertz and mid-infrared spectral ranges. By simply tailoring the structural geometry and dimensions, we show that subwavelength metal/dielectric structures enable dramatic reduction of Fresnel reflection and significant enhancement of transmission at a substrate surface, operating either at two discrete narrow bands or over a broad bandwidth up to 28%. We also use a semianalytical interference model to interpret the obtained results, in which we find that the dispersion of the constituent structures plays a critical role in achieving the observed broadband optical antireflection.

Original languageEnglish
Pages (from-to)2111-2116
Number of pages6
JournalACS Photonics
Volume4
Issue number9
DOIs
Publication statusPublished - 2017 Sep 20
Externally publishedYes

Keywords

  • Metala'dielectrica'metal structure
  • Metamaterials
  • Metasurfaces
  • Mid-infrared
  • Optical antireflection
  • Terahertz spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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