12 May 2016 Nanophotonic waveguides for chip-scale raman spectroscopy: Theoretical considerations
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Abstract
Highly evanescent nanophotonic waveguides enable extremely efficient Raman spectroscopy in chip-scale photonic integrated circuits due to the continuous excitation and collection of Raman scattering along the entire waveguide length. Such waveguides can be used for detection and identification of condensed-phase analytes, or, if functionalized by a sorbent as a top-cladding, can be used to detect trace concentrations of chemical species. The scattering efficiency is modified in guided-mode structures compared to unconfined, micro-Raman geometries. Here, we describe the theoretical framework for understanding the Raman scattering efficiency in nanophotonic waveguides, and compare these calculations to our measurements of trace gases in hypersorbent-clad silicon nitride waveguides.
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Todd H. Stievater, Todd H. Stievater, Jacob B. Khurgin, Jacob B. Khurgin, Scott A. Holmstrom, Scott A. Holmstrom, Dmitry A. Kozak, Dmitry A. Kozak, Marcel W. Pruessner, Marcel W. Pruessner, William S. Rabinovich, William S. Rabinovich, R. Andrew McGill, R. Andrew McGill, } "Nanophotonic waveguides for chip-scale raman spectroscopy: Theoretical considerations", Proc. SPIE 9824, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVII, 982404 (12 May 2016); doi: 10.1117/12.2227905; https://doi.org/10.1117/12.2227905
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