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5 March 2021 Part-per-trillion trace gas detection using frequency-locked whispering gallery mode microtoroids
Cheng Li, Trevor Lohrey, Phuong-Diem Nguyen, Zhouyang Min, Brian Stoltz, Judith Su
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Proceedings Volume 11689, Integrated Optics: Devices, Materials, and Technologies XXV; 116890B (2021) https://doi.org/10.1117/12.2578032
Event: SPIE OPTO, 2021, Online Only
Abstract
We use a system known as FLOWER (frequency locked optical whispering evanescent resonator) to rapidly detect trace amounts of the chemical warfare agent surrogates DIMP and DMMP. We use sorbent polymer layers covalently bound to the surface of the microtoroid cavity to selectively adsorb target gases. As the target gas diffuses into the polymer layer, a measurable change in the resonance frequency of the toroid occurs. We demonstrate 80 ppt (part per trillion) sensing of DIMP; two orders of magnitude better than what can be achieved using mass spectroscopy.
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Cheng Li, Trevor Lohrey, Phuong-Diem Nguyen, Zhouyang Min, Brian Stoltz, and Judith Su "Part-per-trillion trace gas detection using frequency-locked whispering gallery mode microtoroids", Proc. SPIE 11689, Integrated Optics: Devices, Materials, and Technologies XXV, 116890B (5 March 2021); https://doi.org/10.1117/12.2578032
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KEYWORDS
Chemical weapons
Gases
Polymers
Basic research
Mass spectrometry
Medicine
Microresonators
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