Trenches Would Reduce Cross-Talk Among Microlensed QWIPs

Cross-talk in integrated-circuit focal-plane arrays of quantum-well photodetectors (QWIPs) equipped with microlenses would be reduced, according to a proposal, by etching deep trenches into the substrates of these devices. The proposal applies, more specifically, to GaAs-based, back-side-illuminated QWIP arrays with microlenses - devices like those described in the preceding article.