Affiliation:
1. Purple Mountain Observatory, Chinese Academy of Sciences 1 , 10 Yuanhua Road, Nanjing 210033, China
2. University of Science and Technology of China 2 , 96 Jinzhai Road, Hefei 230026, China
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.
Funder
National Key Research and Development Program of China
Chinese Academy of Sciences
National Natural Science Foundation of China