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Multiplexing of hot-electron nanobolometers using microwave SQUIDs

Show simple item record Karasik, Boris S. Day, Peter K. Kawamura, Jonathan H. Bumble, Bruce LeDuc, Henry G. 2015-05-14T23:22:46Z 2015-05-14T23:22:46Z 2009-07-20
dc.identifier.citation Low Temeprature Detectors Workshop (LTD-13), Palo Alto, California, July 20-24, 2009 en_US
dc.identifier.clearanceno 09-3307
dc.description.abstract We have obtained the first data on the multiplexed operation of titanium hot-electron bolometers (HEB). Because of their low thermal conductance and small electron heat capacity nanobolometers are particularly interesting as sensors for far-infrared spectroscopy and mid- and near-IR calorimetry. However, the short time constant of these devices (~ μs at 300-400 mK) makes time domain or audio-frequency domain multiplexing impractical. The Microwave SQUID (MSQUID) approach pursued in this work uses dc SQUIDs coupled to X-band microresonators which are, in turn, coupled to a transmission line. We used a 4-element array of Ti HEBs operated at 415 mK in a He3 dewar with an optical fiber access. The microwave signal exhibited 10-MHz wide resonances at individual MSQUD frequencies between 9 GHz and 10 GHz. The resonance depth is modulated by the current through the bolometer via a change of the SQUID flux state. The transmitted signal was amplified by a cryogenic amplifier and downconverted to baseband using an IQ mixer. A 1-dB per Φ₀/2 responsivity was sufficient for keeping the system noise at the level of ~ 2 pA/Hz1/2. This is more than an order of magnitude smaller than phonon noise in the HEB. The devices were able to detect single near- IR photons (1550 nm) with a time constant of 3.5 μs. Follow-on work will scale the array to larger size and will address the microwave frequency signal generation and processing using a digital transceiver. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2009 en_US
dc.subject microresonator en_US
dc.subject microwave readout en_US
dc.title Multiplexing of hot-electron nanobolometers using microwave SQUIDs en_US
dc.type Preprint en_US

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