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Multiple quantum well infrared photodetectors (QWIPs) with bi-periodic grating couplers have been demonstrated. The bi-periodic grating consists of two gratings with different periods. The response linewidths of such QWIPs are found to be much wider than those of conventional grating coupled QWIPs. By using bi-periodic gratings for coupling the radiation into QWIPs, the influence of variation of material and grating quality on the performance of QWIP can be largely eliminated.
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Lee et al. (1992) studied this question.
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