Photon-counting microscopy imaging in the terahertz (THz) region has been realized with a resolution of 0.05mm for a free space wavelength of 0.13mm. The system incorporates quantum-dot photon detectors into a scanning confocal optical microscope. Minimal requirements for practical application have been fulfilled by improving the operation speed of photon detection by a factor of 100, expanding the operation temperatures beyond 0.3 K and achieving a dynamic range more than 30dB. We use this microscope to probe extremely weak cyclotron emission with less than femto-watt powers radiated from quantum Hall effect devices, which leads to direct visualization of nonequilibrium electrons generated between Landau levels.


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    Title :

    Quantum-dot photon detectors and photon-counting terahertz imaging


    Contributors:
    Ikushima, K. (author) / Hasegawa, T. (author) / Komiyama, S. (author) / Ueda, T. (author) / Hirakawa, K. (author)


    Publication date :

    2005-01-01


    Size :

    2019724 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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