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Advanced Heterodyne Instrument Concepts for SIS and HEB FPAs in High Frequency Astronomy

This document explores various heterodyne instrument concepts focusing on superconducting integrated circuit (SIS) and hot electron bolometer (HEB) focal plane arrays (FPAs) operating between 1000-1400 GHz. Technologies discussed include mature junction technology with >1 mW local oscillator (LO) power, achieving near quantum limits, and dual sideband (2SB) performance with wide intermediate frequency (IF) bandwidth. Specific observed lines such as [CII] at 158 µm, [OI] at 63 µm, and [NII] at 205 µm are highlighted, alongside a cooled Schottky receiver for ~3 THz operations.

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Advanced Heterodyne Instrument Concepts for SIS and HEB FPAs in High Frequency Astronomy

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  1. SOFIA Heterodyne Instrument Concepts • Band 8.5 or 9.5 SIS FPA • Mature junction technology • >1 mW LO power available • 1000-1400 GHz SIS • Near quantum limit • 2SB, 68-118 GHz IF • HEB FPA • 20x quantum limit, narrow IF bandwidth • Specific lines: e.g. [CII] (158 m) , [OI] (63 m), [NII] (205 m) • Cooled Schottky Receiver for ~3 THz • See Erickson poster • 2x HEB noise temp, but 10-20x IF bandwidth

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