Abstract
We propose to use silicon nitride (Si3N4) based photonic waveguides in a lab-on-a-chip
context for Raman spectroscopy. The evanescent tail of the guided modes can efficiently
excite Raman active molecules located in the cladding of a waveguide. Similarly, a
significant fraction of the total emitted Stokes power is evanescently coupled to the
same mode. We calculate the spontaneous Raman scattering efficiency as a function of
Si3N4 strip waveguide dimensions and show that under typical conditions, the efficiency
is in the order of 10-8. Preliminary experimental results are reported, as the first
demonstration of waveguide assisted Raman spectroscopy (to the best of our
knowledge). Related Projects
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