Waveguide-Integrated Mid-Infrared Photodetection using Graphene on a Scalable Chalcogenide Glass Platform
arXiv:2112.14857 · doi:10.1038/s41467-022-31607-7
Abstract
The development of compact and fieldable mid-infrared (mid-IR) spectroscopy devices represents a critical challenge for distributed sensing with applications from gas leak detection to environmental monitoring. Recent work has focused on mid-IR photonic integrated circuit (PIC) sensing platforms and waveguide-integrated mid-IR light sources and detectors based on semiconductors such as PbTe, black phosphorus and tellurene. However, material bandgaps and reliance on SiO substrates limit operation to wavelengths . Here we overcome these challenges with a chalcogenide glass-on-CaF PIC architecture incorporating split-gate photothermoelectric graphene photodetectors. Our design extends operation to with a Johnson noise-limited noise-equivalent power of , no fall-off in photoresponse up to , and a predicted 3-dB bandwidth of . This mid-IR PIC platform readily extends to longer wavelengths and opens the door to applications from distributed gas sensing and portable dual comb spectroscopy to weather-resilient free space optical communications.
arXiv comment15 pages, 11 figures
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