Strong Metasurface–Josephson Plasma Resonance Coupling in Superconducting La 2− x Sr x CuO 4
- Department of Physics University of California San Diego La Jolla CA 92093 USA
- Department of Mechanical Engineering Boston University Boston MA 02215 USA
- Department of Physics Kyung Hee University Seoul 02447 Republic of Korea
- Department of Mechanical Engineering Columbia University New York NY 10027 USA
- Department of Physics Columbia University New York NY 10027 USA
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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