Many applications use SWIR LEDs to illuminate a subject, but illumination is often only half the story. The identification of materials relies on the ability to accurately measure the SWIR absorption, transmittance, or reflectivity of the subject. Ushio Epitex photodetectors, also known as sensors or photodiodes, can be delivered for the sole purpose of SWIR wavelength measurement. It is also possible to package photosensitive diodes with light-emitting diodes to create a dual-function component.

The Ushio Epitex collection contains a variety of indium gallium arsenide (InGaAs) photodetectors for the explicit purpose of sensing the presence of SWIR wavelengths. InGaAs sensors are highly responsive to wavelengths between 1000 nm and 1750 nm, which are beyond the spectral range of traditional silicon-based CMOS sensors.