CSIP – A Novel Photon-Counting Detector Applicable for the SPICA Far-Infrared Instrument
The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo, 153-8902, Japan
2 National Institute of Information and Communications Technology, Nukuikitamachi 4-2-1, Koganei, 184-8795, Tokyo, Japan
3 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai 3-1-1, Sagamihara, Kanagawa, 229-8510, Japan
4 Nagoya University, Furocho, Chikusa, Nagoya, 464-8601, Japan
We describe a novel GaAs/AlGaAs double-quantumwell device for the infrared photon detection, called ChargeSensitive Infrared Phototransistor (CSIP). The principle of CSIP detector is the photo-excitation of an intersubband transition in a QW as an charge integrating gate and the signal ampliﬁcation by another QW as a channel with very high gain, which provides us with extremely high responsivity (104 – 106 A/W). It has been demonstrated that the CSIP designed for the mid-infrared wavelength (14.7 μm) has an excellent sensitivity; the noise equivalent power (NEP) of 7 × 10-19 W/ with the quantum effciency of ~ 2%. Advantages of the CSIP against the other highly sensitive detectors are, huge dynamic range of > 106, low output impedance of 103 – 104 Ohms, and relatively high operation temperature (> 2 K). We discuss possible applications of the CSIP to FIR photon detection covering 35 – 60 μm waveband, which is a gap uncovered with presently available photoconductors.
Key words: Instrumentation: detectors / Infrared: general / Missions: SPICA
© Owned by the authors, published by EDP Sciences, 2009