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Author (up) An, Zhenghua; Chen, Jeng-Chung; Ueda, T.; Komiyama, S.; Hirakawa, K. openurl 
  Title Infrared phototransistor using capacitively coupled two-dimensional electron gas layers Type Journal Article
  Year 2005 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 86 Issue Pages 172106 - 172106-3  
  Keywords 2DEG  
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  Notes Approved no  
  Call Number RPLAB @ akorneev @ Serial 603  
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Author (up) Doi, Y.; Wang, Z.; Ueda, T.; Nickels, P.; Komiyama, S.; Patrashin, M.; Hosako, I.; Matsuura, S.; Shirahata, M.; Sawayama, Y.; Kawada, M. openurl 
  Title CSIP – a novel photon-counting detector applicable for the SPICA far-infrared instrument Type Journal Article
  Year 2009 Publication SPICA Abbreviated Journal SPICA  
  Volume Issue SPICA Workshop 2009 Pages  
  Keywords detectors; Infrared  
  Abstract 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.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 672  
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