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Bruno, V; DeVault, C; Vezzoli, S; Kudyshev, Z; Huq, T; Mignuzzi, S; Jacassi, A; Saha, S; Shah, Y D; Maier, S A; Cumming, D R S; Boltasseva, A; Ferrera, M; Clerici, M; Faccio, D; Sapienza, R; Shalaev, V M
Physical review letters, 2020-Jan-31, Letnik: 124, Številka: 4Journal Article
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 ∼30%. Optical pumping at frequency ω induces a nonlinear polarization oscillating at 2ω 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.
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