25 September 1996 Coupling efficiency of metal gratings in a normal incident GaAs/AlGaAs quantum well infrared detector
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Abstract
A numerical calculation of coupling efficiency of planar metal grating coupled GaAs/AlGaAs quantum well infrared detectors has been made in this work. The results showed that the coupling efficiency is a function of the ratio of the grating period (Lambda) to the intersubband resonance wavelength (lambda) for various degrees of metal filling. In the vicinity of n(Lambda) /(lambda) < 1 (n is the refractive index), filling factors round 0.5 - 0.7 give large longitudinal electric-field components, which induces a strong coupling to the intersubband absorption in the quantum well structures of the semiconductor. Numerical calculations provide detailed guidelines for obtaining optimum coupling for GaAs/AlGaAs quantum well infrared detectors.
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Yu Jun Yang, Yu Jun Yang, Guanqun Xia, Guanqun Xia, Shichang Zou, Shichang Zou, Xun Wang, Xun Wang, "Coupling efficiency of metal gratings in a normal incident GaAs/AlGaAs quantum well infrared detector", Proc. SPIE 2894, Detectors, Focal Plane Arrays, and Applications, (25 September 1996); doi: 10.1117/12.252121; https://doi.org/10.1117/12.252121
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