PT Journal
AU Doi, Y
   Wang, Z
   Ueda, T
   Nickels, P
   Komiyama, S
   Patrashin, M
   Hosako, I
   Matsuura, S
   Shirahata, M
   Sawayama, Y
   Kawada, M
TI CSIP – a novel photon-counting detector applicable for the SPICA far-infrared instrument
SO SPICA
JI SPICA
PY 2009
IS SPICA Workshop 2009
DE detectors; Infrared
AB 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 ampli<ef><ac><81>cation 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.
ER