# Upmost efficiency, few-micron-sized midwave infrared HgCdTe photodetectors

## TL;DR

This paper presents a design for a highly efficient, few-micron-sized midwave infrared HgCdTe photodetector with nearly 100% resonant polarized absorptance, using a novel cavity structure with grating layers.

## Contribution

It introduces a new resonant-cavity enhanced photodetector design that replaces traditional mirrors with grating-on-layer structures, achieving high efficiency with manufacturing tolerance.

## Key findings

- Achieves nearly 100% polarized absorptance at target wavelength.
- Demonstrates design robustness with manufacturing tolerances.
- Visualizes electromagnetic field distributions and power flow topology.

## Abstract

A few-micron thick structure that shows nearly 100% resonant polarized absorptance at a predefined midinfrared wavelength is designed and simulated. Like resonant-cavity enhanced photodetector structure, it contains a thin absorber enclosed in a dielectric cavity but surrogates the mirrors by two grating-on-layer structures. Fair manufacturing tolerance while maintaining high peak efficiency is proved. Electromagnetic fields amplitudes and Poynting vector over the cavity-absorber area are visualized and topology of electromagnetic power flow for two linear polarizations is discussed.