NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Multiplexing of Hot-Electron Nanobolometers Using Microwave SQUIDsWe 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 (approximately microseconds 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 ??/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 ?s. Follow-on work will scale the array to larger size and will address the microwave frequency signal generation and processing using a digital transceiver.
Document ID
20150009141
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Karasik, Boris S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Day, Peter K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kawamura, Jonathan H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bumble, Bruce
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
LeDuc, Henry G.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
June 1, 2015
Publication Date
July 20, 2009
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Low Temperature Detectors Workshop (LTD-13)
Location: Palo Alto, CA
Country: United States
Start Date: July 20, 2009
End Date: July 24, 2009
Sponsors: Stanford Linear Accelerator Center, Stanford Univ., Kavli Inst. for Particle Astrophysics and Cosmology
Distribution Limits
Public
Copyright
Other
Keywords
microwave readout
microresonator

Available Downloads

There are no available downloads for this record.
No Preview Available