We report a fast, room temperature detection scheme for the polarization ellipticity of laser radiation, with a bandwidth that stretches from the infrared to the terahertz range. The device consists ...of two elements, one in front of the other, that detect the polarization ellipticity and the azimuthal angle of the ellipse. The elements respectively utilise the circular photogalvanic effect in a narrow gap semiconductor and the linear photogalvanic effect in a bulk piezoelectric semiconductor. For the former we characterized both a HgTe quantum well and bulk Te, and for the latter, bulk GaAs. In contrast with optical methods our device is an easy to handle all-electric approach, which we demonstrated by applying a large number of different lasers from low power, continuous wave systems to high power, pulsed sources.
Photogalvanic effects in HgTe quantum wells Wittmann, B.; Ravash, R.; Diehl, H. ...
2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics,
2007-Sep.
Conference Proceeding
We report on the observation of the terahertz radiation induced circular (CPGE) and linear (LPGE) photogalvanic effects in HgTe quantum wells. The current response is well described by the ...phenomenological theory of CPGE and LPGE.
We report on the observation of the terahertz radiation induced circular (CPGE) and linear (LPGE) photogalvanic effects in HgTe quantum wells. The current response is well described by the ...phenomenological theory of CPGE and LPGE.
The general purpose detector CMD-2 at the VEPP-2M electron-positron collider at Novosibirsk has collected about 11 pb{sup -1} of integrated luminosity in the center-of-mass energy range from 0.36 up ...to 1.38 GeV. Data in the {rho}-meson energy range from 0.61 to 0.96 GeV have been analysed and preliminary results on the e{sup +}e{sup -}{yields}{pi}{sup +}{pi}{sup -} cross-section in this energy range are presented.
Far-infrared cyclotron resonance photoconductivity (CRP) is investigated in HgTe quantum wells (QWs) of various widths grown on (013) oriented GaAs substrates. From the resonance magnetic field ...strength effective masses and their dependence on the carrier concentration is obtained. Combining optical methods with transport measurements we found that the transport time substantially exceeds the cyclotron resonance lifetime as well as the quantum lifetime which is the shortest.
We report on the observation of the terahertz radiation induced circular (CPGE) and linear (LPGE) photogalvanic effects in HgTe quantum wells. The current response is well described by the ...phenomenological theory of CPGE and LPGE.
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