# Scalable interdigitated photoconductive emitters for the electrical modulation of terahertz beams with arbitrary linear polarization

## TL;DR

This paper introduces a scalable, multi-element interdigitated photoconductive emitter capable of broadband THz polarization rotation, enabling fast, electrically controlled modulation of THz beam polarization for advanced applications.

## Contribution

It presents a novel scalable device design for broadband THz polarization control using separate pixels for horizontal and vertical emission, with simple electrical tuning.

## Key findings

- Demonstrated broadband operation from 0.3 to 5.0 THz.
- Achieved rapid, electrical polarization modulation.
- Validated device scalability and effective polarization control.

## Abstract

A multi-element interdigitated photoconductive emitter for broadband THz polarization rotation is proposed and experimentally verified. The device consists of separate pixels for the emission of horizontally and vertically polarized THz radiation. The broadband (0.3-5.0THz) nature of the device is demonstrated, and the polarization angle of the generated far-field THz radiation is shown to be readily controlled by varying the relative bias voltage applied to the horizontally and vertically emitting pixels. The device is scalable in design, and with its simple method of polarization rotation it allows the modulation of the generated THz polarization at rates significantly faster than those achievable in ellipsometry systems based on mechanically rotating components.