研究課題
There are two main accomplishments in the final year. First, we have finished the assessment of the 4-pixel SIS mixer array. The results undoubtedly proved that the hybrid planar integration(HPI) approach is technically feasible for highly compact SIS mixer focal-plane arrays. Second, we have made a breakthrough in fabrication of thin-film resistors based on NbTiN by using reactive sputtering. By applying this method, we have fabricated 2SB MMIC devices. Preliminary measurement results demonstrated expected sideband separation performance.The overall study aims to make essential breakthroughs in the techniques of constructing large-format and compact superconducting multibeam receiver frontends. The major achievements of this study are as follows. (1) The innovative HPI approach has been proposed and developed to allow construction of compact superconducting heterodyne focal plane arrays. This approach is based on two key technologies, namely silicon-based superconducting monolithic microwave integrated circuit(MMIC) and silicon membrane-based waveguide probes; (2) A single pixel proof-of-concept SIS mixer based on the HPI approach has been developed at 125-164 GHz frequency band with dual-polarization receiving capability and balanced mixing configuration. The measurement results of this model showed nearly state-of-the-art performance; (3) A 2 x 2 compact array has been developed at the same frequency band following the HPI approach. This prototype achieved the unprecedent compactness and demonstrated even LO distribution and unaffected single-pixel performance.
すべて 2021 2020
すべて 雑誌論文 (2件) (うち査読あり 1件) 学会発表 (8件) (うち国際学会 1件、 招待講演 1件)
IEEE Transactions on Terahertz Science and Technology
巻: 10 ページ: 677～689
10.1109/TTHZ.2020.3025097
SPIE Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X
巻: 11445 ページ: -
10.1117/12.2561603
