Abstract:

Terahertz (THz) imaging technology is growing rapidly due to its variety of potential applications in security screening, biotech pharmacy, industrial inspection, and material characterization. However, the practical feasibility of THz imaging systems is significantly limited by the low efficiency of active THz devices, long imaging acquisition time, and insufficient use of THz signal datasets. To address these limitations, we propose a high-precision, time-resolved terahertz tomography system based on plasmonic THz photoconductive antennas to offer significantly higher SNR than conventional THz imaging setups. Furthermore, we present an algorithm, terahertz differential pulse delay computed tomography (THz DPD-CT), utilizing temporal and spatial correlation of measured THz signals for time-resolved terahertz tomographic imaging, which significantly enhances the image quality of the measured objects. This paves the way toward real-time, hyperspectral terahertz 3D imagers in the near future, opening the door for various exciting applications in non-destructive sensing, imaging, and material inspection.

Bio:

Dr. Shang-Hua Yang is an Associate Professor in the Department of Electrical Engineering and College of Semiconductor Research at National Tsing Hua University and an Honorary Professor in the Department of Mathematical Sciences at the University of Liverpool. Dr. Yang has established significant contributions to the development of THz optoelectronics, THz communication, THz imaging, and innovative plasmonic photonics applications. The outcomes of his research have appeared in over 100 refereed papers in peer-reviewed journals and conference proceedings on these topics. He has received several prestigious awards and scholarships, including the IEEE Antennas and Propagation Society Doctoral Research Award (2014), Taiwanese Government Scholarship to Study Abroad (2015), Joan and Irvin Jacobs TIX Institute Industry Scholar (2017, 2018), MOST Young Scholar Fellowship (2018), NTHU Young Faculty Research Award (2020), Human Frontier Science Program Research Grant Award (2020) and CIEE Excellent Electrical Engineer Award (2022). He was the Director of NTHU Garage Incubator (2018-2020), Deputy Executive Director of NTHU Zai Wu College (2018-2020), and has served in several IEEE/SPIE conference Technical Program Committee boards since 2020. Dr. Yang is currently the Deputy Director of NTHU THz Optics & Photonics Center.