Solid-state micro-spectrometer based on a linear array of infrared resonant-cavity-enhanced photodetectors

Adam P. Craig; Mark Carmichael; Terry D. Golding; Andrew R. Marshall

doi:10.1117/12.2665957

14 June 2023 Solid-state micro-spectrometer based on a linear array of infrared resonant-cavity-enhanced photodetectors

Adam P. Craig, Mark Carmichael, Terry D. Golding, Andrew R. Marshall

Proceedings Volume 12541, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV; 1254107 (2023) https://doi.org/10.1117/12.2665957
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

We demonstrate a novel solid-state spectrometer employing a linear array of resonant cavity enhanced photodiodes (RCE-PDs) with a spatial chirp. By epitaxially grading the thicknesses of the distributed Bragg reflector mirrors, the chirp can cover a total bandwidth of ≥0.1 × λres where λres is the resonant wavelength. This new class of sensor is intended for analyzing IR absorption fingerprints and our group has already demonstrated conventional RCE-PDs between 2.2 – 7.8 μm. In theory the range between 1.55 and ~12 μm could be served using the same materials. This region covers important spectral fingerprints including chemical and pollutant gases, as well as threat agents including thiodiglycol and VX.

Conference Presentation

Citation Download Citation

Adam P. Craig, Mark Carmichael, Terry D. Golding, and Andrew R. Marshall "Solid-state micro-spectrometer based on a linear array of infrared resonant-cavity-enhanced photodetectors", Proc. SPIE 12541, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV, 1254107 (14 June 2023); https://doi.org/10.1117/12.2665957

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