Title :
Quantum-dot photon detectors and photon-counting terahertz imaging
Author :
Ikushima, K. ; Hasegawa, T. ; Komiyama, S. ; Ueda, T. ; Hirakawa, K.
Author_Institution :
Dept. of Basic Sci., Tokyo Univ., Japan
Abstract :
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.
Keywords :
Hall effect devices; Landau levels; cyclotrons; optical microscopy; photon counting; quantum Hall effect; semiconductor quantum dots; submillimetre wave imaging; 0.13 mm; Landau levels; extremely weak cyclotron emission; femto-watt powers; nonequilibrium electrons; optical microscope; photon-counting microscopy imaging; photon-counting terahertz imaging; quantum Hall effect devices; quantum-dot photon detectors; Detectors; Dynamic range; Electron microscopy; Image resolution; Optical imaging; Optical microscopy; Quantum dots; Stimulated emission; Temperature distribution; Ultrafast optics;
Conference_Titel :
Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on
Print_ISBN :
0-7803-9348-1
DOI :
10.1109/ICIMW.2005.1572508
