Asymmetric Offset Multi-Electrode Photoconductive Antenna for Terahertz Wave Polarization Control
Year: 2026
Type: article
Abstract: Conventional multi-electrode photoconductive antennas (PCAs) can only radiate linearly polarized terahertz waves with polarization angles in increments of 45°, limiting their use for the characterization of diverse anisotropic material. We propose a multi-electrode PCA with an asymmetric offset electrode structure, enabling linear polarization at 30° increments. Furthermore, the electrode design is optimized with a semicircular geometry to reduce electric field concentration at electrode edges, effectively suppressing electrical breakdown. Simulation results demonstrate that the applied bias voltage can be increased to 70 V, yielding a radiation power of 14.5 µW. The proposed design thus achieves dynamic polarization control without sacrificing output power.
Source: Photonics
Authors: Fangyuan Wang, Xiaolong Hu
Institution: South China University of Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,896
OpenAlex ID: W7162520205