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.
Highlights
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
We present a CMOS-compatible silicon-based, chip-scale mid-IR dual-comb spectrometer that meets the requirements for vibrational Dual-comb spectroscopy (DCS) and mid-IR molecular fingerprinting in the condensed phase
Integrated PIN diodes, located around the resonators, are operated at a reversebias voltage of −15 V to sweep out the free carriers (FC) generated from three-photon absorption (3PA)[25]
Summary
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)[1–20] is a non-intrusive absorption spectroscopy technique that measures the time-domain interference between two frequency combs of slightly different line spacing.
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