IV-VI resonant cavity enhanced photodetectors for the midinfrared

TL;DR

This paper demonstrates a mid-infrared resonant cavity enhanced photodetector using lead salt heterostructures, achieving narrow cavity resonance at low temperatures around 3.6 microns.

Contribution

It introduces a resonant-cavity design for mid-infrared photodetectors based on lead salt heterostructures with high spectral selectivity at cryogenic temperatures.

Findings

Single narrow cavity resonance observed below 140 K

Line width of only 2% at 80 K

Operates effectively at 3.6 microns

Abstract

A resonant-cavity enhanced detector operating in the mid-infrared at a wavelength around 3.6 micron is demonstrated. The device is based on a narrow-gap lead salt heterostructure grown by molecular beam epitaxy. Below 140 K, the photovoltage clearly shows a single narrow cavity resonance, with a relative line width of only 2 % at 80 K.