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Doi, Y., Wang, Z., Ueda, T., Nickels, P., Komiyama, S., Patrashin, M., et al. (2009). CSIP – a novel photon-counting detector applicable for the SPICA far-infrared instrument. SPICA, (SPICA Workshop 2009).
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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Irimajiri, Y., Kumagai, M., Morohashi, I., Kawakami, A., Nagano, S., Sekine, N., et al. (2014). Phase-locking of a THz-QCL using a Low Noise HEB mixer, and a Frequency-comb as a Reference. In 39th Int. Conf. IRMMW-THz (pp. 1–2).
Abstract: We have developed a phase-locking system of a 3.1THz QCL (Quantum Cascade Laser) using a low noise hot electron bolometer mixer (HEBM) and a THz reference. The THz reference was generated by photomixing two optical modes of a frequency comb. The THz-QCL and HEBM devices are fabricated in our laboratory. A line width of the phase-locked QCL of narrower than 1Hz was achieved.
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