🥞✨ Congratulations to Ms. Siriwan Paklue, a member of the PBP CMU Electron Linac Laboratory (PCELL), on her publication in Infrared Physics & Technology 📓✨

Topic: Development and optimization of a PCA-based terahertz time-domain spectroscopy system for high-resolution material characterization

Siriwan Pakluea, Chia Jia Yi, Monchai Jitvisate, Chitrlada Thongbai and Sakhorn Rimjaem

Link: https://doi.org/10.1016/j.infrared.2025.106060

This study presents the first homemade THz Time Domain Spectroscopy (THz-TDS) system in Thailand, developed to overcome the high cost and limited availability of commercial systems. The setup includes locally made photoconductive antenna (PCAs) (using electron-beam-irradiated SI-GaAs) and a Ti:Sapphire femtosecond laser, achieving high signal-to-noise ratio and broad bandwidth. System parameters—like laser power, bias voltage, and scan resolution—were carefully optimized to enhance performance.

The system was validated through material characterization experiments, such as measuring the refractive index and thickness of a silicon wafer, and addressing challenges in liquid-phase measurements, including internal reflections and window material selection. A dry-air enclosure was used to reduce moisture interference.

This work fills critical gaps in the THz-TDS field by providing a cost-effective, high-performance solution and practical guidelines for researchers in resource-constrained environments.