Open AccessMicrofluidic mid-infrared spectroscopy via microresonator-based dual-comb source
Author(s) -
Mengjie Yu,
Yoshitomo Okawachi,
Austin G. Griffith,
Michal Lipson,
Alexander L. Gaeta
Publication year - 2019
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.44.004259
Subject(s) - microfluidics , frequency comb , spectroscopy , interferometry , optics , photonics , materials science , optoelectronics , free spectral range , infrared spectroscopy , absorption (acoustics) , wavelength , nanotechnology , physics , laser , quantum mechanics
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.