Josephson-vortex-flow terahertz emission in layered high-$T_c$ superconducting single crystals

TL;DR

This paper demonstrates tunable terahertz emission in layered high-$T_c$ superconductors driven by Josephson vortices, confirming the potential for solid-state terahertz devices.

Contribution

It reports the first successful continuous, tunable terahertz emission from Josephson vortex resonance in high-$T_c$ superconducting crystals.

Findings

Terahertz emission achieved at 0.6-1 THz range.

Emission confirmed via Shapiro-step detection.

Potential for solid-state terahertz device development.

Abstract

We report on the successful terahertz emission (0.6$\sim$1 THz) that is continuous and tunable in its frequency and power, by driving Josephson vortices in resonance with the collective standing Josephson plasma modes excited in stacked Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ intrinsic Josephson junctions. Shapiro-step detection was employed to confirm the terahertz-wave emission. Our results provide a strong feasibility of developing long-sought solid-state terahertz-wave emission devices.