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Sensors 2010, 10(9), 8411-8423; doi:10.3390/s100908411
Review

Novel Ultra-Sensitive Detectors in the 10–50 μm Wavelength Range

1,2,*  and 2
1 CREST, Japan Science and Technology Agency/5 Sambancho, Chiyoda-ku, Yokyo, 102-0075, Japan 2 Department of Basic Science, the University of Tokyo/3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
* Author to whom correspondence should be addressed.
Received: 29 July 2010 / Revised: 13 August 2010 / Accepted: 31 August 2010 / Published: 8 September 2010
(This article belongs to the Special Issue Photodetectors and Imaging Technologies)
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Abstract

We have developed novel single-photon detectors in the 10–50 μm wavelength region. The detectors are charge-sensitive infrared phototransistors (CSIPs) fabricated in GaAs/AlGaAs double quantum well (QW) structures, in which a photo-generated hole (+e) in the floating gate (upper QW) modulates the conductance of a capacitively-coupled channel located underneath (lower QW). The excellent noise equivalent power (NEP = 8.3 × 10−19 W/Hz1/2) and specific detectivity (D* = 8 × 1014 cm Hz1/2/W) are demonstrated for 15 micron detection up to 23 K, which are by a few orders of magnitude better than those of other state-of-the-art high-sensitivity detectors. The dynamic range exceeds 106 (~aW to pW) by repeatedly resetting the accumulated holes in the upper QW. Simple device structure makes the detectors feasible for array fabrication: Furthermore, monolithic integration with reading circuits will be possible.
Keywords: terahertz detector; far-infrared detector; ultra-sensitive detector; photon-counter; single-photon detector; charge-sensitive infrared phototransistor (CSIP) terahertz detector; far-infrared detector; ultra-sensitive detector; photon-counter; single-photon detector; charge-sensitive infrared phototransistor (CSIP)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ueda, T.; Komiyama, S. Novel Ultra-Sensitive Detectors in the 10–50 μm Wavelength Range. Sensors 2010, 10, 8411-8423.

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