Photon counting detectors for the far infrared

Details Photon counting detectors for the far infrared Photon counting detectors for the far infrared

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605..275a&link_type=abstract

LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p

Physics

Photodetectors, Single Electron Devices

Scientific paper

Single-electron transistor (SET) operation of a quantum dot (QD), fabricated in a GaAs/AlxGa1-xAs heterostructure crystal is demonstrated to serve as an extremely high sensitivity detector of far-infrared (FIR). When the single QD is placed in a high magnetic field, the resonant conductance through the SET switches on (off) upon the excitation of just one electron to a higher Landau level inside the QD, thereby enabling us to detect individual events of FIR-photon absorption (λ=0.17-0.22 mm). Additionally, we demonstrate that the SET consisting of two parallel QDs operates as a high sensitivity detector of FIR approaching the single-photon counting level in the absence of magnetic fields. .

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