Qi Liang, Minkevičius Linas, Urbanowicz Andrzej, Švigelj Andrej, Grigelionis Ignas, Kašalynas Irmantas, Trontelj Janez, Valušis Gintaras
Center for Physical Sciences and Technology (FTMC), Department of Optoelectronics, Saulėtekio Ave. 3, LT-10257 Vilnius, Lithuania.
Laboratory for Microelectronics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, 1000 Ljubljana, Slovenia.
Sensors (Basel). 2021 May 18;21(10):3510. doi: 10.3390/s21103510.
An ability of lensless titanium-based antenna coupled microbolometers (Ti-μbolometers) operating at room temperature to monitor precisely radiation patterns in terahertz time-domain spectroscopy (THz-TDS) systems are demonstrated. To provide comprehensive picture, two different THz-TDS systems and Ti-μbolometers coupled with three different antennas-narrowband dipole antennas for 0.3 THz, 0.7 THz and a log-periodic antenna for wideband detection-were selected for experiments. Radiation patterns, spatial beam profiles and explicit beam evolution along the propagation axis are investigated; polarization-sensitive properties under various THz emitter power ranges are revealed. It was found that the studied Ti-μbolometers are convenient lensless sensors suitable to discriminate and control THz radiation pattern features in various wideband THz-TDS systems.
展示了室温下工作的无透镜钛基天线耦合测辐射热计（Ti-μbolometers）在太赫兹时域光谱（THz-TDS）系统中精确监测辐射方向图的能力。为了提供全面的情况，选择了两种不同的THz-TDS系统以及与三种不同天线耦合的Ti-μbolometers——用于0.3太赫兹、0.7太赫兹的窄带偶极天线和用于宽带检测的对数周期天线——进行实验。研究了辐射方向图、空间光束轮廓以及沿传播轴的明确光束演变；揭示了在各种太赫兹发射器功率范围内的偏振敏感特性。结果发现，所研究的Ti-μbolometers是方便的无透镜传感器，适用于区分和控制各种宽带THz-TDS系统中的太赫兹辐射方向图特征。
