Nanophotonic waveguides for chip-scale raman spectroscopy: Theoretical considerations

Todd H. Stievater; Jacob B. Khurgin; Scott A. Holmstrom; Dmitry A. Kozak; Marcel W. Pruessner; William S. Rabinovich; R. Andrew McGill

doi:10.1117/12.2227905

12 May 2016 Nanophotonic waveguides for chip-scale raman spectroscopy: Theoretical considerations

Todd H. Stievater, Jacob B. Khurgin, Scott A. Holmstrom, Dmitry A. Kozak, Marcel W. Pruessner, William S. Rabinovich, R. Andrew McGill

Author Affiliations +

Proceedings Volume 9824, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVII; 982404 (2016) https://doi.org/10.1117/12.2227905
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

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, Jacob B. Khurgin, Scott A. Holmstrom, Dmitry A. Kozak, Marcel W. Pruessner, William S. Rabinovich, and 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); https://doi.org/10.1117/12.2227905

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