Title: 3D plasmonic design approach for efficient transmissive Huygens metasurfaces

Abstract

In this paper we present a design concept for 3D plasmonic scatterers as high- efficiency transmissive metasurface (MS) building blocks. A genetic algorithm (GA) routine partitions the faces of the walls inside an open cavity into a M x N grid of voxels which can be either covered with metal or left bare, and optimizes the distribution of metal coverage needed to generate electric and magnetic modes of equal strength with a targeted phase delay (Φ_t) at the design wavelength. Even though the electric and magnetic modes can be more complicated than typical low order modes, with their spectral overlap and equal strengths, they act as a Huygens source, with the accompanying low reflection magnitude. Square/hexagonal voxels inside square/rectangular cavities are thoroughly analyzed for operation at 8 µm, although the technique can be applied to different cavity geometries for operation across the electromagnetic spectrum. Results from full-wave simulations show the GA routine can repeatedly pinpoint scatterer geometries emitting at any Φt value across 2π phase space with transmittances of at least 60%, making these MS building blocks an attractive plasmonic alternative for practical optical applications. Full-scale metasurface devices are calculated from near-fields of the individual elements to validate the opticalmore » functionality.« less

Authors:

Adomanis, Bryan ;

• Search DOE PAGES for author "Adomanis, Bryan"
• Search DOE PAGES for ORCID "0000-0002-0216-9227"

Bruce Burckel, D. ;

• Search DOE PAGES for author "Bruce Burckel, D."
• Search DOE PAGES for ORCID "0000-0003-2222-047X"

Marciniak, Michael

Publication Date:

Thu Jul 11 00:00:00 EDT 2019

Research Org.:

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); Defense Advanced Research Projects Agency (DARPA); USDOE Office of Science (SC)

OSTI Identifier:

1568902

Alternate Identifier(s):

OSTI ID: 1605734

Report Number(s):

SAND-2020-2197J
Journal ID: ISSN 1094-4087; OPEXFF

Grant/Contract Number:  

AC04-94AL85000; NA0003525; HR001172671

Resource Type:

Published Article

Journal Name:

Optics Express

Additional Journal Information:

Journal Name: Optics Express Journal Volume: 27 Journal Issue: 15; Journal ID: ISSN 1094-4087

Publisher:

Optical Society of America (OSA)

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING