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arXiv · 1908.03908

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

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

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V. Bruno, C. DeVault, S. Vezzoli, Z. Kudyshev, T. Huq, S. Mignuzzi, A. Jacassi, S. Saha, Y. D. Shah, S. A. Maier, D. R. S. Cumming, A. Boltasseva, M. Ferrera, M. Clerici, D. Faccio, R. Sapienza, V. M. Shalaev. 2019-08-11. Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systems. https://doi.org/10.1103/physrevlett.124.043902

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