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

Journal Article · · Physical Review Letters
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. In this work, the introduction of a strongly coupled plasmonic system therefore provides a simple and effective route towards the implementation of ENZ physics at the nanoscale.
Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); US Air Force Office of Scientific Research (AFOSR); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; United Kingdom Research and Innovation (UKRI)
Grant/Contract Number:
SC0017717
OSTI ID:
1803146
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 124; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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