Surface-Wave Propagation on Non-Hermitian Metasurfaces With Extreme Anisotropy
- 2 March 2021
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 69 (4), 2060-2071
- https://doi.org/10.1109/tmtt.2021.3057632
Abstract
Electromagnetic metasurfaces enable the advanced control of surface-wave propagation by spatially tailoring the local surface reactance. Interestingly, tailoring the surface resistance distribution in space provides new, largely unexplored degrees of freedom. In this article, we show that suitable spatial modulations of the surface resistance between positive (i.e., loss) and negative (i.e., gain) values can induce peculiar dispersion effects, far beyond mere compensation. Taking inspiration from the parity-time symmetry concept in quantum physics, we put forward and explore a class of non-Hermitian metasurfaces that may exhibit extreme anisotropy mainly induced by the gain-loss interplay. Through analytical modeling and full-wave numerical simulations, we illustrate the associated phenomenon of surface-wave canalization, explore nonlocal effects and possible departures from the ideal conditions, and address the feasibility of the required constitutive parameters. Our results suggest intriguing possibilities to dynamically reconfigure the surface-wave propagation and are of potential interest for applications to imaging, sensing, and communications.Keywords
Funding Information
- University of Sannio FRA program
- Simons Foundation
- Air Force Office of Scientific Research
This publication has 67 references indexed in Scilit:
- The Performance of Active Coated Nanoparticles Based on Quantum-Dot Gain MediaAdvances in OptoElectronics, 2012
- The dielectric function of PbS quantum dots in a glass matrixOptical Materials Express, 2012
- Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and RefractionScience, 2011
- Complex modes and near-zero permittivity in 3D arrays of plasmonic nanoshells: loss compensation using gain [Invited]Optical Materials Express, 2011
- Lanthanide-Based Luminescent Hybrid MaterialsChemical Reviews, 2009
- Digital spatial light modulatorsNature Photonics, 2009
- Optical Conformal MappingScience, 2006
- Controlling Electromagnetic FieldsScience, 2006
- Guided waves on a planar tensor impedance surfaceIEEE Transactions on Antennas and Propagation, 2003
- Real Spectra in Non-Hermitian Hamiltonians HavingSymmetryPhysical Review Letters, 1998