Development of the nano-HEB array for low-background far-IR applications
Abstract
We present an overview of the recent progress made in the development of a far-IR array of ultrasensitive hot-electron nanobolometers (nano-HEB) made from thin titanium (Ti) films. We studied electrical noise, signal and noise bandwidth, single-photon detection, optical noise equivalent power (NEP), and a microwave SQUID (MSQUID) based frequency domain multiplexing (FDM) scheme. The obtained results demonstrate the very low electrical NEP down to 1.5 × 10^(-20) W/Hz^(1/2) at 50 mK determined by the dominating phonon noise. The NEP increases with temperature as ~ T^3 reaching ~10^(-17) W/Hz^(1/2) at the device critical temperature T_C = 330-360 mK. Optical NEP = 8.6 × 10^(-18) W/Hz^(1/2) at 357 mK and 1.4 × 10^(-18) W/Hz^(1/2) at 100 mK respectively, agree with thermal and electrical data. The optical coupling efficiency provided by a planar antenna was greater than 50%. Single 8-μm photons have been detected for the first time using a nano-HEB operating at 50-200 mK thus demonstrating a potential of these detectors for future photon-counting applications in mid-IR and far-IR. In order to accommodate the relatively high detector speed (~μs at 300 mK, ~100 μs at 100 mK), an MSQUID based FDM multiplexed readout with GHz carrier frequencies has been built. Both the readout noise ~2 pA/Hz^(1/2) and the bandwidth > 150 kHz are suitable for nano-HEB detectors.
Additional Information
© 2010 SPIE. This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration and funded in part through the internal Research and Technology Development program. The research of S.V. Pereverzev was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, California Institute of Technology, administered by Oak Ridge Associated Universities through a contract with NASA. The authors thank A. Soibel (JPL) for lending the 8-µm QCL and M. Wanke (Sandia National Laboratories) for lending the 100-µm QCL.Attached Files
Published - development_of_nano-HEB.pdf
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Additional details
- Eprint ID
- 65314
- Resolver ID
- CaltechAUTHORS:20160311-143706778
- NASA/JPL/Caltech
- JPL Research and Technology Development Fund
- NASA Postdoctoral Program
- Created
-
2016-03-14Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Keck Institute for Space Studies
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 7741