A triple band local oscillator coupling system based on a phase grating for five-meter Dome-A terahertz explorer telescope

GuoAo Xie; ZhengHeng Luo; KangMin Zhou; Dong Liu; Wei Miao; Wen Zhang; Yuan Ren; ShengCai Shi

doi:10.1063/5.0150192

A triple band local oscillator coupling system based on a phase grating for five-meter Dome-A terahertz explorer telescope

Rev Sci Instrum. 2023 Sep 1;94(9):094502. doi: 10.1063/5.0150192.

Authors

GuoAo Xie^{1

2}, ZhengHeng Luo^{1

2}, KangMin Zhou¹, Dong Liu¹, Wei Miao¹, Wen Zhang¹, Yuan Ren¹, ShengCai Shi¹

Affiliations

¹ Purple Mountain Observatory, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing 210033, China.
² University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China.

PMID: 37721507
DOI: 10.1063/5.0150192

Abstract

For heterodyne receivers, broadband and integrated local oscillator (LO) coupling schemes are crucial. In this paper, we present a novel terahertz broadband receiver system based on a one-pixel phase grating. We designed a phase grating that can simultaneously couple the LO signals at 690, 850, and 1300 GHz to a superconducting hot-electron bolometer mixer at the incident angles of 25.7°, 20.6°, and 13.3°, respectively. At these three frequencies, the measured diffraction efficiencies of the phase grating are as high as 70%, 73%, and 65%, and the total power coupling efficiencies of the LO coupling system are 22%, 23%, and 23%, in good agreement with the simulated results. This efficient and highly integrated multiband receiver system has potential applications in the proposed Five-meter Dome-A Terahertz Explorer telescope.