15 July 2010 Development of the nano-HEB array for low-background far-IR applications
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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/Hz1/2 at 50 mK determined by the dominating phonon noise. The NEP increases with temperature as ~ T3 reaching ~ 10-17 W/Hz1/2 at the device critical temperature TC = 330-360 mK. Optical NEP = 8.6×10-18 W/Hz1/2 at 357 mK and 1.4×10-18 W/Hz1/2 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/Hz1/2 and the bandwidth > 150 kHz are suitable for nano-HEB detectors.
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Boris S. Karasik, Boris S. Karasik, Sergey V. Pereverzev, Sergey V. Pereverzev, David Olaya, David Olaya, Michael E. Gershenson, Michael E. Gershenson, Robin Cantor, Robin Cantor, Jonathan H. Kawamura, Jonathan H. Kawamura, Peter K. Day, Peter K. Day, Bruce Bumble, Bruce Bumble, Henry G. LeDuc, Henry G. LeDuc, Steve P. Monacos, Steve P. Monacos, Dennis G. Harding, Dennis G. Harding, Daniel Santavicca, Daniel Santavicca, Faustin Carter, Faustin Carter, Daniel E. Prober, Daniel E. Prober, } "Development of the nano-HEB array for low-background far-IR applications", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 774119 (15 July 2010); doi: 10.1117/12.856682; https://doi.org/10.1117/12.856682
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