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Long period grating for 3–5 µm quantum-well infra-red photodetectors

Long period grating for 3–5 µm quantum-well infra-red photodetectors

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By considering all possible high order diffracted waves, the authors calculate the coupling efficiency of long period gratings for 3–5 µm quantum-well infra-red photodetectors (QWIPs) on the basis of the modal expansion model (MEM). A large coupling efficiency for 3–5 µm QWIPs has been demonstrated. This greatly reduces the difficulties in fabricating 3–5 µm grating coupled QWIPs and opens the way to fabricate high performance 3–5 µm and two colour QWIPs image arrays.

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