Microfluidic mid-infrared spectroscopy via microresonator-based dual-comb source

Over the past decade, microresonator-based soliton combs based on photonic integration have broadened the scope of applications in sensing, ranging, and imaging. The large comb line spacing on the order of hundreds of gigahertz allows for rapid acquisition of absorption spectra in the condensed matt...

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Bibliographic Details
Published in:Optics letters 2019-09, Vol.44 (17), p.4259
Main Authors: Yu, Mengjie, Okawachi, Yoshitomo, Griffith, Austin G, Lipson, Michal, Gaeta, Alexander L
Format: Article
Language:English
Subjects:
Absorption spectra
Acetone
Aliasing
Chemical synthesis
Condensed matter physics
Infrared spectra
Microfluidics
Organic chemistry
Photonics
Solitary waves
Spectrum analysis
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Summary:Over the past decade, microresonator-based soliton combs based on photonic integration have broadened the scope of applications in sensing, ranging, and imaging. The large comb line spacing on the order of hundreds of gigahertz allows for rapid acquisition of absorption spectra in the condensed matter phase without aliasing via a dual-comb interferometer. We present a proof-of-principle demonstration of high-throughput label-free microresonator-based dual-comb spectroscopy in a microfluidic chip that dynamically probes the linear absorption of liquid acetone in the mid-infrared wavelength regime. We measure the flow dynamics of an acetone droplet with a spectral acquisition rate of 25 kHz (40 μs per spectrum) covering a spectral range from 2900 to 2990 nm. Combining microfluidics and silicon-photonic technology would potentially enable a compact time-resolved spectroscopy system for a wide range of applications such as chemical synthesis, biological cell-sorting, and lab-on-a-chip.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.004259