Generation of tunable Terahertz out-of-plane radiation using Josephson vortices in modulated layered superconductors

TL;DR

This paper demonstrates that moving Josephson vortices in modulated layered superconductors can generate tunable out-of-plane THz radiation efficiently, overcoming impedance mismatch issues common in previous designs.

Contribution

It introduces a novel method for generating tunable out-of-plane THz radiation using Josephson vortices in modulated layered superconductors, enhancing emission efficiency.

Findings

Out-of-plane THz radiation is generated by moving Josephson vortices.

The emitted magnetic and electric fields are of comparable magnitude.

The design allows efficient emission without impedance mismatch.

Abstract

We show that a moving Josephson vortex in spatially modulated layered superconductors generates out-of-plane THz radiation. Remarkably, the magnetic and in-plane electric fields radiated are of the same order, which is very unusual for any good-conducting medium. Therefore, the out-of-plane radiation can be emitted to the vacuum without the standard impedance mismatch problem. Thus, the proposed design can be more efficient for tunable THz emitters than previous proposals, for radiation only propagating along the ab-plane.