Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systems
- Resource Type
- Working Paper
- Authors
- 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.
- Source
- Phys. Rev. Lett. 124, 043902 (2020)
- Subject
- Physics - Optics
- Language
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