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Waveguide-integrated mid-infrared photodetection using graphene on a scalable chalcogenide glass platform

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...

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Detalles Bibliográficos
Autores principales: Goldstein, Jordan, Lin, Hongtao, Deckoff-Jones, Skylar, Hempel, Marek, Lu, Ang-Yu, Richardson, Kathleen A., Palacios, Tomás, Kong, Jing, Hu, Juejun, Englund, Dirk
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9262905/
https://www.ncbi.nlm.nih.gov/pubmed/35798746
http://dx.doi.org/10.1038/s41467-022-31607-7
Descripción
Sumario: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(2) substrates limit operation to wavelengths λ ≲ 4 μm. Here we overcome these challenges with a chalcogenide glass-on-CaF(2) PIC architecture incorporating split-gate photothermoelectric graphene photodetectors. Our design extends operation to λ = 5.2 μm with a Johnson noise-limited noise-equivalent power of 1.1 nW/Hz(1/2), no fall-off in photoresponse up to f = 1 MHz, and a predicted 3-dB bandwidth of f(3dB) > 1 GHz. 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.