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Title: Multipolar Coupling in Hybrid Metal–Dielectric Metasurfaces

In this paper, we study functional hybrid metasurfaces consisting of metal–dielectric nanoantennas that direct light from an incident plane wave or from localized light sources into a preferential direction. The directionality is obtained by carefully balancing the multipolar contributions to the scattering response from the constituents of the metasurface. The hybrid nanoantennas are composed of a plasmonic gold nanorod acting as a feed element and a silicon nanodisk acting as a director element. In order to experimentally realize this design, we have developed a two-step electron-beam lithography process in combination with a precision alignment step. Finally, the optical response of the fabricated sample is measured and reveals distinct signatures of coupling between the plasmonic and the dielectric nanoantenna elements that ultimately leads to unidirectional radiation of light.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [4] ;  [1] ;  [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. Australian National Univ., Canberra, ACT (Australia); Karlsruhe Inst. of Technology (KIT) (Germany)
  3. Australian National Univ., Canberra, ACT (Australia) ; Friedrich Schiller Univ., Jena (Germany)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Karlsruhe Inst. of Technology (KIT) (Germany)
Publication Date:
OSTI Identifier:
1265167
Report Number(s):
SAND2016--5456J
Journal ID: ISSN 2330-4022; 644957
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
ACS Photonics
Additional Journal Information:
Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2330-4022
Publisher:
American Chemical Society
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY directional radiation properties; metal−dielectric metasurfaces; multipolar radiation; subwavelength nanostructures