title: Evanescent excitation and collection of spontaneous Raman spectra using silicon nitride nanophotonic waveguides.
abstract: We experimentally demonstrate the use of high contrast, CMOS-compatible integrated photonic waveguides for Raman spectroscopy. We also derive the dependence of collected Raman power with the waveguide parameters and experimentally verify the derived relations. Isopropyl alcohol (IPA) is evanescently excited and detected using single-mode silicon-nitride strip waveguides. We analyze the measured signal strength of pure IPA corresponding to an 819  cm⁻¹ Raman peak due to in-phase C-C-O stretch vibration for several waveguide lengths and deduce a pump power to Raman signal conversion efficiency on the waveguide to be at least 10⁻¹¹  per cm.
authors: Ashim
authors: A
authors: Dhakal
authors: Ananth Z
authors: AZ
authors: Subramanian
authors: Pieter
authors: P
authors: Wuytens
authors: Frédéric
authors: F
authors: Peyskens
authors: Nicolas
authors: N
authors: Le Thomas
authors: Roel
authors: R
authors: Baets
mesh_terms: D019840:2-Propanol / Q000032:analysis; D055620:Optical Phenomena; D017655:Silicon Compounds; D013059:Spectrum Analysis, Raman / Q000295:instrumentation / Q000379:methods*
chemical_list: D017655:Silicon Compounds; D019840:2-Propanol; C032734:silicon nitride