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 subwavelength film. The plasmonic resonance of the metal resonators strongly interacts with the optical ENZ modes, providing a Rabi level spitting of similar to 30%. Optical pumping at frequency. induces a nonlinear polarization 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 4 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.

Negative Refraction in Time-Varying Strongly Coupled Plasmonic-Antenna-Epsilon-Near-Zero Systems

Clerici M;
2020-01-01

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 subwavelength film. The plasmonic resonance of the metal resonators strongly interacts with the optical ENZ modes, providing a Rabi level spitting of similar to 30%. Optical pumping at frequency. induces a nonlinear polarization 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 4 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.
2020
Bruno, V; Devault, C; Vezzoli, S; Kudyshev, Z; Huq, T; Mignuzzi, S; Jacassi, A; Saha, S; Shah, Yd; Maier, Sa; Cumming, Drs; Boltasseva, A; Ferrera, M; Clerici, M; Faccio, D; Sapienza, R; Shalaev, Vm
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2165598
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