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5 September 2014 Visible-light controlled plasma excitations in high electron mobility GaAs/AlGaAs heterostructure
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Terahertz detectors based on GaAs/AlGaAs heterostructure were investigated at low temperatures and high magnetic fields. A response of detectors showed a line caused by a cyclotron resonance transition which was accompanied by several peaks originated form excitation of magnetopasmons. Illumination with a visible light caused an increase of the plasma concentration and resulted in a change of the magnetoplasmon spectrum. An analysis of spectra allowed to determine changes in the plasmon dispersion relation with a visible light which gives a tool to tune a THz response of a plasmonic detector.
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M. Białek, M. Marcinkiewicz, T. Tarkowski, J. Wróbel, V. Umansky, B. Piętka, and J. Łusakowski "Visible-light controlled plasma excitations in high electron mobility GaAs/AlGaAs heterostructure", Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990Z (5 September 2014);

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