A 90-102 GHz CMOS based pulsed Fourier transform spectrometer: New approaches for in situ chemical detection and millimeter-wave cavity-based molecular spectroscopy

Deacon J. Nemchick, Brian J. Drouin, Matthew J. Cich, Timothy Crawford, Adrian J. Tang, Yanghyo Kim, Theodore J. Reck, Erich T. Schlecht, Mau-Chung Chang, Gabriel Virbila

Research output: Contribution to journalArticle

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Abstract

We present a system level description of a cavity-enhanced millimeter-wave spectrometer that is the first in its class to combine source and detection electronics constructed from architectures commonly deployed in the mobile phone industry and traditional pulsed Fourier transform techniques to realize a compact device capable of sensitive and specific in situ gas detections. The instrument, which has an operational bandwidth of 90-102 GHz, employs several unique components, including a custom-designed pair of millimeter-wave transmitter and heterodyne receiver integrated circuit chips constructed with 65 nm complementary metal-oxide semiconductor (CMOS) techniques. These elements are directly mated to a hybrid coupling structure that enables free-space interaction of the electronics with a small gas volume while also acting as a cavity end mirror. Instrument performance for sensing of volatile compounds is highlighted with experimental trials taken in bulk gas flows and seeded molecular beam environments.

Original languageEnglish
Article number073109
JournalReview of Scientific Instruments
Volume89
Issue number7
DOIs
StatePublished - 1 Jul 2018

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