15 May 2014 Silicon-nitride waveguides for on-chip Raman spectroscopy
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Abstract
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. Further, the enhancement effects inherent to the waveguide, alongside with the long interaction length, lead to an increased light-matter interaction, resulting in a higher sensitivity as required by spectroscopic applications, especially in the context of Raman spectroscopy. We calculate the spontaneous Raman scattering efficiency as a function of silicon-nitride strip waveguide dimensions and show that under typical conditions, the overall efficiency is approximately two orders of magnitude higher than in confocal configuration in the free space. We also report the experimental demonstration of the use of silicon-nitride based photonic waveguides in a lab-on-a-chip context for Raman spectroscopy. To the best of our knowledge, this is the first demonstration of Raman spectroscopy using photonic waveguides.
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Ashim Dhakal, Ashim Dhakal, Pieter Wuytens, Pieter Wuytens, Frederic Peyskens, Frederic Peyskens, Ananth Z. Subramanian, Ananth Z. Subramanian, Nicolas Le Thomas, Nicolas Le Thomas, Roel Baets, Roel Baets, } "Silicon-nitride waveguides for on-chip Raman spectroscopy", Proc. SPIE 9141, Optical Sensing and Detection III, 91411C (15 May 2014); doi: 10.1117/12.2057509; https://doi.org/10.1117/12.2057509
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