ULTRA-SENSITIVE REFRACTIVE INDEX GAS SENSOR WITH FUNCTIONALIZED SILICON NITRIDE PHOTONIC CIRCUITS

Portable and cost-effective gas sensors are gaining demand for a number of environmental, biomedical, and industrial applications, yet current devices are confined into specialized labs and cannot be extended to general use.Here, we demonstrate a part-per-billion-sensitive refractive index gas sensor on a photonic chip based on silicon nitride wave

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