TST, Vol. 15, No. 1, PP. 1-20
(Invited paper) Emergent progress in the interaction of terahertz wave and functional materials
Tianyu An, Jinxiu Yuan, Shupeng Tian, Yiwen Hu, Hongfu Zhu, and Qiwu Shi *
College of Material Science and Engineering, Sichuan University, Chengdu, Sichuan 610064, China
* Email: shiqiwu@scu.edu.cn
(Received March 2022)
Abstract: Terahertz (THz) technology has attracted great attention for its application potential in next-generation communications, medical imaging, security, etc. The investigation on the interaction of THz wave and functional materials is the fundamental issues for exploring new physics in condensed matter and then developing advanced THz devices. This review elucidates some emergent work focusing on this point, including ultrafast phenomena studied using time-resolved THz spectroscopy, nanoparticles as contrast agents for THz medical imaging, and spintronics in THz range. The technical problems and research difficulties for present and future work are also presented. This review aims to afford researchers a better understanding of the different THz function materials and their applications.
Keywords: THz, Material, Spin dynamics, Biomedical imaging, Spectroscopy
doi:
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TST, Vol. 15, No. 1, PP. 21-30
(Invited paper) A hybrid antenna coupled Nb5N6 microbolometer for dual polarization THz detection
Chengtao Jiang 1, Pengfei Chen 1, Mengxin Liu 1, Chao Wan 2, Xuecou Tu 1*, 2, Xiaoqing Jia 1, 2, Lin Kang 1, 2, Jian Chen 1, 2, and Peiheng Wu 1
1 Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
2 Purple Mountain Laboratories, Nanjing 211111, China
*1 Email: tuxuecou@nju.edu.cn
(Received March 2022)
Abstract: A hybrid antenna coupled Nb5N6 microbolometer was demonstrated for dual polarization terahertz (THz) THz detection. By adding a ring resonant antenna (RRA) in another vertical direction and optimizing the structure of the hybrid antenna, the electric field intensity at the center of the antenna was maximized in both horizontal and vertical polarization directions，and the corresponding electric field at 0.193 THz were 60 V/m and 65 V/m, respectively. The hybrid antenna coupled Nb5N6 microbolometer THz detector was prepared. The measurement results verify the dual polarization characteristics of the detector. The maximum voltage responsivity of the antenna coupled detector in the horizontal direction at 0.198 THz was roughly the same as the vertical direction at 0.202 THz. While the voltage responsivity of the Nb5N6 microbolometer detector without RRA in the vertical polarization direction was 2.75 times larger than that of the horizontal direction. These results clearly show that the hybrid antenna coupled Nb5N6 microbolometer detector has the advantage of improving the voltage responsivity in the other direction, and thus realizing dual polarization THz detection. It has great potential applications in the field of the THz security inspection and spectral imaging.
Keywords: Nb5N6 microbolometer, THz detection, Dual polarization
doi:
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