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Metasurfaces atop metamaterials: surface morphology induces linear dichroism in gyroid optical metamaterials

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Title: Metasurfaces atop metamaterials: surface morphology induces linear dichroism in gyroid optical metamaterials
Authors: Dolan, JA
Dehmel, R
Demetriadou, A
Gu, Y
Wiesner, U
Wilkinson, TD
Gunkel, I
Hess, O
Baumberg, JJ
Steiner, U
Saba, M
Wilts, BD
Item Type: Journal Article
Abstract: Optical metamaterials offer the tantalizing possibility of creating extraordinary optical properties through the careful design and arrangement of subwavelength structural units. Gyroid-structured optical metamaterials possess a chiral, cubic, and triply periodic bulk morphology that exhibits a redshifted effective plasma frequency. They also exhibit a strong linear dichroism, the origin of which is not yet understood. Here, the interaction of light with gold gyroid optical metamaterials is studied and a strong correlation between the surface morphology and its linear dichroism is found. The termination of the gyroid surface breaks the cubic symmetry of the bulk lattice and gives rise to the observed wavelength- and polarization-dependent reflection. The results show that light couples into both localized and propagating plasmon modes associated with anisotropic surface protrusions and the gaps between such protrusions. The localized surface modes give rise to the anisotropic optical response, creating the linear dichroism. Simulated reflection spectra are highly sensitive to minute details of these surface terminations, down to the nanometer level, and can be understood with analogy to the optical properties of a 2D anisotropic metasurface atop a 3D isotropic metamaterial. This pronounced sensitivity to the subwavelength surface morphology has significant consequences for both the design and application of optical metamaterials.
Issue Date: 11-Jan-2019
Date of Acceptance: 14-Oct-2018
URI: http://hdl.handle.net/10044/1/64336
DOI: https://dx.doi.org/10.1002/adma.201803478
ISSN: 0935-9648
Publisher: Wiley
Journal / Book Title: Advanced Materials
Volume: 31
Issue: 2
Copyright Statement: © 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and re-production in any medium, provided the original work is properly cited.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Engineering and Physical Sciences Research Council
Funder's Grant Number: RG72590
EP/L027151/1
EP/L024926/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
cubic symmetry
gyroid-structured materials
metasurfaces
optical metamaterials
optical anisotropy
cubic symmetry
gyroid-structured materials
metasurfaces
optical anisotropy
optical metamaterials
cubic symmetry
gyroid-structured materials
metasurfaces
optical anisotropy
optical metamaterials
Nanoscience & Nanotechnology
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Publication Status: Published
Conference Place: Germany
Article Number: 1803478
Online Publication Date: 2018-11-04
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences



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