Abstract-THz Vector Field Measurement Comparison Between On-the-Fly and Step Scan Method

Jie Hu, Zheng Lou, Qi-Jun Yao,  Wei Miao, Jin-Ping Yang,  Zhen-Hui Lin,  Sheng-Cai Shi,

http://ieeexplore.ieee.org/document/7797489/

A fast terahertz vector field measurement system based on the on-the-fly (OTF) scan method is investigated. Compared with the step scan method, which samples at certain step, the OTF scan obtains the data with the scanner moving continuously, thus improving the measurement efficiency to some extent. The phase stability of the system is fully studied. Demonstration at approximately 500 GHz is compared with the result by the step scan method, showing that the OTF method can improve the measurement speed by a factor of 7 while the data accuracy is almost the same. Measurements at different scanning speeds and with different probes are also compared to understand their effects.

A THz Superconducting Imaging Array Developed for the DATE5 Telescope

Sheng-Cai Shi, Wen Zhang, Jing Li, Wei Miao, Zhen-Hui Lin, Zheng Lou, Qi-Jun Yao

http://paperity.org/p/74626764/a-thz-superconducting-imaging-array-developed-for-the-date5-telescope

Dome A in Antarctica, located at an altitude of 4093 m and with very low temperature in winter down to −83∘C, is an exceptionally dry site. Measurements of the atmospheric transmission in the range of 0.75–15 THz by a Far-infrared/THz Fourier transform spectrometer (FTS) strongly suggest that Dome A is a unique site for ground-based THz observations, especially for the 200- and 350-micron windows. A 5-m THz telescope (DATE5) is therefore proposed for Chinese Antarctic Kunlun Observatory. We are currently developing a THz superconducting imaging array (TeSIA) for the DATE5. The TeSIA will be working at the 350-\upmum window, with a pixel number of 32×32 and a sensitivity (NEP) of ∼10−16 W/Hz0.5. Ti transition-edge sensors with time-domain multiplexing and TiN microwave kinetic inductance detectors with frequency-domain multiplexing are both developed for the TeSIA. In this paper, detailed system designs and some measurement results will be presented.