Paper

Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systems

Bruno, V, Jacassi, A, Maier, S A, Clerici, M, Kudyshev, Z, Saha, S, Cumming, D R S, Ferrera, M, Mignuzzi, S, Shalaev, V M, DeVault, C, Sapienza, R, Faccio, D, Shah, Y D, Vezzoli, S, Huq, T, Boltasseva, A

2019

Overview

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

• Publisher: Cornell University Library, arXiv.org
• Subject: Control equipment / Electromagnetic properties / Nanoantennas / Optical pumping / Wave propagation