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This content will become publicly available on August 9, 2018

Title: Bilayer Metasurfaces for Dual- and Broadband Optical Antireflection

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. Furthermore, by simply tailoring the structural geometry and dimensions, here 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.
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [3] ; ORCiD logo [4] ;  [5] ; ORCiD logo [2] ; ORCiD logo [2]
  1. Harbin Inst. of Technology (China). Physics Dept.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
  4. The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, China
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-23975
Journal ID: ISSN 2330-4022
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
ACS Photonics
Additional Journal Information:
Journal Volume: 4; Journal Issue: 9; Journal ID: ISSN 2330-4022
Publisher:
American Chemical Society (ACS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metal−dielectric−metal structure; metamaterials; metasurfaces; mid-infrared; optical antireflection; terahertz spectroscopy
OSTI Identifier:
1406223