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Evanescent excitation and collection of spontaneous Raman spectra using silicon nitride nanophotonic waveguides

2014; Optica Publishing Group; Volume: 39; Issue: 13 Linguagem: Inglês

10.1364/ol.39.004025

1539-4794

Ashim Dhakal, Ananth Z. Subramanian, Pieter Wuytens, Frédéric Peyskens, Nicolas Le Thomas, Roel Baets,

Mechanical and Optical Resonators

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.