Journal
ACS PHOTONICS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.2c00381
Keywords
MIR photonics; photonic integrated circuit; reconfigurable photonics; optical MEMS; on-chip spectrometer
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Funding
- Singapore Ministry of Education [MOE2019-T2-2-104]
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On-chip spectrometers based on silicon photonics offer a compact, energy-efficient, and cost-effective solution to biochemical spectroscopy and hyperspectral imaging. In this study, the researchers propose an on-chip computational spectrometer in the mid-infrared range using an MEMS-enabled silicon photonic integrated device, which features low power consumption, single-pixel detection, and multiplexing advantages.
On-chip spectrometers using silicon photonics offer a compact, energy-efficient, and cost-effective solution to biochemical spectroscopy and hyperspectral imaging in integrated and portable application scenarios. The mid-infrared (MIR) spectral band is critical to spectroscopic sensing. However, the existing on-chip spectrometer approaches are limited in the MIR. Here, we present an on-chip computational spectrometer in MIR (3.7-4.05 mu m) using an MEMS-enabled silicon photonic integrated device, which is realized via the time-domain modulation of reconfigurable waveguide couplers. The electrostatically actuated on-chip spectrometer intrinsically features low power consumption and single-pixel detection and offers multiplexing advantages, potentially leading to a high signal-to-noise ratio. We achieve laser spectrum reconstruction across a large bandwidth (350 nm) experimentally. Furthermore, based on a linear superposition assumption, we achieve the polychromatic light reconstruction of narrow spectral features (3 nm resolution) and a broad absorption spectrum of nitrous oxide gas using a regularized regression method.
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