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Non-Hermitian metasurface with non-trivial topology

Non-Hermitian metasurface with non-trivial topology

Authors :
Yang Frank
Prasad Ciril S.
Li Weijian
Lach Rosemary
Everitt Henry O.
Naik Gururaj V.
Source :
Nanophotonics, Vol 11, Iss 6, Pp 1159-1165 (2022)
Publication Year :
2022
Publisher :
De Gruyter, 2022.

Abstract

The synergy between topology and non-Hermiticity in photonics holds immense potential for next-generation optical devices that are robust against defects. However, most demonstrations of non-Hermitian and topological photonics have been limited to super-wavelength scales due to increased radiative losses at the deep-subwavelength scale. By carefully designing radiative losses at the nanoscale, we demonstrate a non-Hermitian plasmonic–dielectric metasurface in the visible with non-trivial topology. The metasurface is based on a fourth order passive parity-time symmetric system. The designed device exhibits an exceptional concentric ring in its momentum space and is described by a Hamiltonian with a non-Hermitian Z3 ${\mathbb{Z}}_{3}$ topological invariant of V = −1. Fabricated devices are characterized using Fourier-space imaging for single-shot k-space measurements. Our results demonstrate a way to combine topology and non-Hermitian nanophotonics for designing robust devices with novel functionalities.

Details

Language :
English
ISSN :
21928614
Volume :
11
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Nanophotonics
Publication Type :
Academic Journal
Accession number :
edsdoj.7922e22d233548d4bec5ddcff26871fc
Document Type :
article
Full Text :
https://doi.org/10.1515/nanoph-2021-0731