A numerical calculation of the coupling efficiency for a perfectly conducting metallic grating for intersubband transitions in semiconductor quantum wells is presented as a function of the ratio of the grating period p to the intersubband resonance wavelength λ for various degrees of metal filling. The effect of grating parameters on the conversion efficiency is discussed. Results provide detailed guidelines for obtaining optimum coupling for infrared devices.
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Li et al. (1992) studied this question.
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