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12 February 2009 Terahertz absorption by resonant plasmon excitations in grating-gated quantum wells
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Terahertz detection using excitations of plasmon modes offers a high-speed, high resolution, and frequency-selective alternative to existing technology. Plasmons in high mobility quantum well two-dimensional electron gas (2DEG) systems can couple to radiation when either the channel carrier density, or the incident radiation, is spatially modulated with appropriate periodicity. Grating-gated terahertz detectors having a voltage tunable frequency response have been developed based on this principle. A continuous wave THz photomixer was used to characterize the resonant absorption in such devices. At the fundamental 2DEG plasmon frequency, defined by the grating and the quantum well carrier density, a 20% change in transmission was observed. As the resonance is tuned from the 'natural' plasmon frequency through application of a gate bias, it shifts as expected, but the transmission change drops to only a few percent.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. A. Barrick, M. C. Wanke, K. Fortier, A. D. Grine, J. L. Reno, S. K. Lyo, E. A. Shaner, and S. J. Allen "Terahertz absorption by resonant plasmon excitations in grating-gated quantum wells", Proc. SPIE 7215, Terahertz Technology and Applications II, 721509 (12 February 2009);


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