# Control of Circularly Polarized THz Wave from Intrinsic Josephson Junctions by Local Heating

## TL;DR

This study introduces a method to generate and control circularly polarized THz waves from intrinsic Josephson junctions using local heating, enhancing their applicability in various technological fields.

## Contribution

It demonstrates that local heating of a nearly square mesa-structure IJJ can produce and manipulate circularly polarized THz emissions, offering a practical control mechanism.

## Key findings

- Circularly polarized THz waves can be emitted by locally heated square mesa IJJs.
- Polarization states are highly sensitive to the position of local heating.
- Local heating enables high controllability of THz emission polarization.

## Abstract

This paper reports a practical method of generating circularly polarized terahertz (THz) waves from intrinsic Josephson junctions (IJJs) and controlling their polarization states by external local heating. We theoretically find that a mesa-structure IJJ whose geometry is almost square can emit circularly polarized THz waves by local heating of the mesa. Moreover, we demonstrate that the polarization states of the THz waves change dramatically with the local heating position. Our results indicate that the use of local heating can provide a high level of controllability of the THz emissions and significantly extend the range of applications of IJJ-based THz emitters.