Author Affiliations
Abstract
1 School of Electronic Information Engineering, Beihang University, Beijing 100191, China
2 Institute of Modern Optics, Nankai University, Tianjin 300350, China
Terahertz (THz) lenses have numerous applications in imaging and communication systems. Currently, the common THz lenses are still based on the traditional design of a circular convex lens. In this work, we present a method for the design of a 3D-printed multilevel THz lens, taking advantage of the benefits offered by 3D printing technology, including compact size, lightweight construction, and cost-effectiveness. The approach utilizes an inverse design methodology, employing optimization methods to promise accurate performance. To reduce simulation time, we employ the finite-difference time-domain method in cylindrical coordinates for near-field computation and couple it with the Rayleigh–Sommerfeld diffraction theory to address far-field calculations. This technology holds great potential for various applications in the field of THz imaging, sensing, and communications, offering a novel approach to the design and development of functional devices operating in the THz frequency range.
THz lens 3D printing achromatic lens THz communication Chinese Optics Letters
2023, 21(11): 110006
1 浙江师范大学工学院，浙江 金华 321000
2 东南大学毫米波国家重点实验室，江苏 南京 211189
3 德国莱布尼兹高性能创新微电子研究所，法兰克福 15236
4 帕德博恩大学海恩茨-尼克斯多夫研究所，帕德博恩 33102
基于IHP锗硅BiCMOS工艺，研究和实现了两种220 GHz低噪声放大器电路，并将其应用于220 GHz太赫兹无线高速通信收发机电路。一种是220 GHz四级单端共基极低噪声放大电路，每级电路采用了共基极(Common Base, CB)电路结构，利用传输线和金属-绝缘体-金属(Metal-Insulator-Metal, MIM)电容等无源电路元器件构成输入、输出和级间匹配网络。该低噪放电源的电压为1.8 V，功耗为25 mW，在220 GHz频点处实现了16 dB的增益，3 dB带宽达到了27 GHz。另一种是220 GHz四级共射共基差分低噪声放大电路，每级都采用共射共基的电路结构，放大器利用微带传输线和MIM电容构成每级的负载、Marchand-Balun、输入、输出和级间匹配网络等。该低噪放电源的电压为3 V，功耗为234 mW，在224 GHz频点实现了22 dB的增益，3 dB带宽超过6 GHz。这两个低噪声放大器可应用于220 GHz太赫兹无线高速通信收发机电路。
低噪声放大器 共基级 共射共基 太赫兹无线高速通信收发机 BiCMOS工艺 LNA 220 GHz 220 GHz common base cascode high speed THz communication transceiver BiCMOS technology
作为电磁波中从红外光到微波的过渡区，太赫兹波所具有的独特性能已得到了人们的广泛认识。随着太赫兹辐射源、 太赫兹探测器等单元技术研究的不断成熟，美国、欧洲和日本已率先将其应用于空间天文观测、深空探测和对地气象环境监测等领域。重点 总结了这些应用中的技术发展情况，并简要分析了太赫兹雷达与通信技术的研究状况和应用前景。
太赫兹 太赫兹遥感 太赫兹通信 太赫兹雷达 太赫兹成像 太赫兹应用 Terahertz THz remote sensing THz radar THz communication THz imaging THz Application
