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Frontiers in Optics

Silicon Waveguides for Single-Photon Sensing of Toxic NO2 and Flammable CH4 through Correlated Photon Pairs Interconnecting Telecommunication and Mid-Infrared Bands

Abhishek Pandey, Deepak Jain, Catherine Baskiotis

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We propose to use four-wave mixing for correlated photon pairs generation allowing the interconnection of Mid-Infrared band and Telecom bands using Silicon waveguides especially designed for gas sensing.
DOI
10.1364/fio.2025.jw4a.49

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Photon-pair sources are essential for complex and scalable quantum photonics circuits. Silicon photonics offers a scalable and low cost platform with a mature fabrication technology for realising this [1] . Recent demonstrations of photon-pair generation and quantum interference in the 2.1 µm band have paved the way towards mid-infrared integrated photon sources [2] , where many gases can be sensed with unique ‘fingerprint’ absorption lines. Producing long wavelength photons with large spectral detunings from the pump, utilising anomalous group-velocity dispersion and type-0 phase matching, is hard due to the highly dispersive nature of nanoscale silicon waveguides.