Integrated photonics for infrared spectroscopic sensing

TitleIntegrated photonics for infrared spectroscopic sensing
Publication TypeBook Chapter
Year of Publication2017
AuthorsLin, H, Kita, D, Han, Z, Su, P, Agarwal, A, Yadav, A, Richardson, K, Gu, T, Hu, J
EditorFedeli, JM, Vivien, L
Book TitleIntegrated Photonics: Materials, Devices, and Applications Iv
PaginationUNSP - 102490G
PublisherSpie-Int Soc Optical Engineering
ISBN Number978-1-5106-0999-0 978-1-5106-1000-2
Keywordschalcogenide wave-guides, chemical sensors, high-index-contrast, infrared sensors, microring resonators, mid-ir applications, midinfrared photodetector, optical resonators, optical sensors, photothermal spectroscopy, ring-resonator, silicon-on-sapphire, spectroscopy, thin-films, transport-properties

Infrared (IR) spectroscopy is widely recognized as a gold standard technique for chemical analysis. Traditional IR spectroscopy relies on fragile bench-top instruments located in dedicated laboratory settings, and is thus not suitable for emerging field-deployed applications such as in-line industrial process control, environmental monitoring, and point-of-care diagnosis. Recent strides in photonic integration technologies provide a promising route towards enabling miniaturized, rugged platforms for IR spectroscopic analysis. Chalcogenide glasses, the amorphous compounds containing S, Se or Te, have stand out as a promising material for infrared photonic integration given their broadband infrared transparency and compatibility with silicon photonic integration. In this paper, we discuss our recent work exploring integrated chalcogenide glass based photonic devices for IR spectroscopic chemical analysis, including on-chip cavityen-hanced chemical sensing and monolithic integration of mid-IR waveguides with photodetectors.