Silicon-chip-based mid-infrared dual-comb spectroscopy

Mengjie Yu, Yoshitomo Okawachi, Austin G. Griffith, Nathalie Picqué, Michal Lipson and Alexander L. Gaeta ()
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Mengjie Yu: Columbia University
Yoshitomo Okawachi: Columbia University
Austin G. Griffith: Cornell University
Nathalie Picqué: Max-Planck-Institut für Quantenoptik
Michal Lipson: Columbia University
Alexander L. Gaeta: Columbia University

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract The development of a spectroscopy device on a chip that could realize real-time fingerprinting with label-free and high-throughput detection of trace molecules represents one of the big challenges in sensing. Dual-comb spectroscopy (DCS) in the mid-infrared is a powerful technique offering high acquisition rates and signal-to-noise ratios through use of only a single detector with no moving parts. Here, we present a nanophotonic silicon-on-insulator platform designed for mid-infrared (mid-IR) DCS. A single continuous-wave low-power pump source generates two mutually coherent mode-locked frequency combs spanning from 2.6 to 4.1 μm in two silicon microresonators. A proof-of-principle experiment of vibrational absorption DCS in the liquid phase is achieved acquiring spectra of acetone spanning from 2900 to 3100 nm at 127-GHz (4.2-cm−1) resolution. These results represent a significant step towards a broadband, mid-IR spectroscopy instrument on a chip for liquid/condensed matter phase studies.

Date: 2018
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DOI: 10.1038/s41467-018-04350-1

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