Far-infrared/submillimeter imager-polarimeter using distributed antenna-coupled transition edge sensors

Peter K. Day, Henry G. LeDuc, Alexey Goldin, Charles D. Dowell, Jonas Zmuidzinas, Jonas Zmuidzinas, Wayne S. Holland, Stafford Withington
2004 Millimeter and Submillimeter Detectors for Astronomy II  
We describe a new concept for a detector for the submillimeter and far infrared that uses a distributed hotelectron transition edge sensor (TES) to collect the power from a focal-plane-filling slot antenna array. Because superconducting transmission lines are lossy at frequencies greater than about 1 Thz, the sensors must directly tap the antenna, and therefore must match the antenna impedance (∼ 30 ohms). Each pixel contains many TESs that are all wired in parallel as a single distributed TES,
more » ... le distributed TES, which results in a low impedance that can match to a multiplexed SQUID readout. These detectors are inherently polarization sensitive, with very low cross-polarization, but can also be easily configured to sum both polarizations for imaging applications. The single polarization version can have a very wide bandwidth of greater than 10:1 with a quantum efficiency greater than 50%. The dual polarization version is narrow band, but can have a higher quantum efficiency. The use of electron-phonon decoupling obviates the need for micro-machining, making the focal plane much easier to fabricate than with absorber-coupled, geometrically isolated pixels. An array of these detectors would be suitable for an imager for the Single Aperture Far Infrared (SAFIR) observatory. We consider two near-term applications of this technology, a 32 × 32 element imaging polarimeter for SOFIA and a 350µm camera for the CSO.
doi:10.1117/12.552440 fatcat:7vu5bkfjk5dv7iazccpnf6reui