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Area of Science:

  • Nanophotonics
  • Spectroscopy
  • Chemical Sensing

Background:

  • Real-time, label-free detection of trace molecules using spectroscopy on a chip remains a significant challenge.
  • Mid-infrared dual-comb spectroscopy (DCS) offers high acquisition rates and signal-to-noise ratios without moving parts.

Purpose of the Study:

  • To present a nanophotonic silicon-on-insulator platform for mid-infrared (mid-IR) dual-comb spectroscopy (DCS).
  • To demonstrate a proof-of-principle experiment for vibrational absorption DCS in the liquid phase.

Main Methods:

  • Utilized a single continuous-wave low-power pump source to generate two mutually coherent mode-locked frequency combs.
  • Employed silicon microresonators to achieve combs spanning 2.6 to 4.1 μm.
  • Acquired spectra of acetone in the liquid phase from 2900 to 3100 nm at 127-GHz resolution.

Main Results:

  • Successfully demonstrated vibrational absorption DCS in the liquid phase.
  • Achieved spectral acquisition of acetone with high resolution (4.2 cm⁻¹).
  • The platform operates in the mid-IR range, crucial for molecular fingerprinting.

Conclusions:

  • The developed nanophotonic silicon-on-insulator platform is suitable for mid-IR DCS.
  • This work represents a significant advancement towards a compact, chip-based spectroscopy instrument for condensed matter studies.
  • The technology enables broadband, high-throughput, label-free sensing.