Type-II superlattice (T2SL)-based detectors as a new platform for mid-IR detectors, aiming to bring the performance of state-of-the-art HgCdTe based designs to room-temperature operation. T2SLs provide a way to highly reduce detector thickness when a thin T2SL layer is implemented in a multilayer core combined with a dielectric metasurface that uses guided mode resonance (GMR) to couple the incoming light into the detector. However, supporting a GMR requires the detector to have significantly expanded spatial area, potentially preventing the creation of truly compact finite detectors. In this work we propose a possible solution to this problem. The proposed design of a detector relies on the reflective metasurface to couple incident light (λ_0) into a guided mode that overlaps T2SL absorber layer. Our analysis demonstrates that the width of the detector must be at least ~20λ_0-wide to achieve ~60% external quantum efficiency (EQE), with narrower detectors exhibiting decreased performance. To counteract this, we propose a design that combines the benefits of GRM and Fabry-Perot cavity enhancement, resulting in 2λ_0-wide, subwavelength-thick detector that in theory achieves ~51% EQE.
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