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12 February 2009 Terahertz absorption by resonant plasmon excitations in grating-gated quantum wells
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Abstract
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.
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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); https://doi.org/10.1117/12.808865
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