Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systems
Abstract
Time-varying metasurfaces are emerging as a powerful instrument for the dynamical control of the electromagnetic properties of a propagating wave. Here we demonstrate an efficient time-varying metasurface based on plasmonic nano-antennas strongly coupled to an epsilon-near-zero (ENZ) deeply sub-wavelength film. The plasmonic resonance of the metal resonators strongly interacts with the optical ENZ modes, providing a Rabi level spitting of ~30%. Optical pumping at frequency {\omega} induces a nonlinear polarisation oscillating at 2{\omega} responsible for an efficient generation of a phase conjugate and a negative refracted beam with a conversion efficiency that is more than four orders of magnitude greater compared to the bare ENZ film. The introduction of a strongly coupled plasmonic system therefore provides a simple and effective route towards the implementation of ENZ physics at the nanoscale
Cite
@article{arxiv.1908.03908,
title = {Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systems},
author = {V. Bruno and C. DeVault and S. Vezzoli and Z. Kudyshev and T. Huq and S. Mignuzzi and A. Jacassi and S. Saha and Y. D. Shah and S. A. Maier and D. R. S. Cumming and A. Boltasseva and M. Ferrera and M. Clerici and D. Faccio and R. Sapienza and V. M. Shalaev},
journal= {arXiv preprint arXiv:1908.03908},
year = {2020}
}