Abstract
The radiative decay of grating-coupled plasmons in a two-dimensional (2D) electron gas in semiconductor heterostructures is an interesting candidate for a solid-state terahertz (Thz) radiation source. We present the first observation of the emission of submillimeter radiation from optically excited coherent two-dimensional plasma oscillations at an AlGaAs/GaAs heterojunction. The surface of the sample is covered with a grating-coupler, allowing the coupling of the plasmons to the Thz- field. The 100-fs pulses from a Ti:Sapphire laser strike the sample under an angle of 45∞. The emitted Thz radiation is detected by time-domain Thz- emission spectroscopy, a technique allowing the selective measurement of coherent (ie, phase-synchronous) FIR radiation phenomena in the frequency range from 0-4 Thz.[1]
© 1996 Optical Society of America
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