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Title: Strong Metasurface–Josephson Plasma Resonance Coupling in Superconducting La 2− x Sr x CuO 4

Journal Article · · Advanced Optical Materials

Abstract Terahertz spectroscopy of the c ‐axis Josephson plasma resonance (JPR) in high‐temperature cuprates is a powerful probe of superconductivity, providing a route to couple to and interact with the condensate. Electromagnetic coupling between metasurface arrays of split ring resonators (SRRs) and the JPR of a La 2− x Sr x CuO 4 single crystal ( T c = 32 K) is investigated. The metasurface resonance frequency (ω MM ), determined by the SRR geometry, is swept through the JPR frequency (ω JPR = 1.53 THz) using a series of interchangeable tapes applied to the same single crystal. Terahertz reflectivity measurements on the resulting hybrid superconducting metamaterials (HSMMs) reveal anticrossing behavior characteristic of strong coupling. The experimental results, validated with numerical simulations, indicate a normalized Rabi frequency of Ω R = 0.29. Further, it is shown that HSMMs with ω MM > ω JPR provide a route to couple to hyperbolic waveguide modes in c ‐axis cuprate samples. This work informs future possibilities for optimizing the coupling strength of HSMMs and investigating nonlinear superconductivity under high field terahertz excitation.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0018218
OSTI ID:
1558129
Journal Information:
Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 21 Vol. 7; ISSN 2195-1071
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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