1. Coupled wave equations theory of surface-enhanced femtosecond stimulated Raman scattering.
- Author
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McAnally, Michael O., McMahon, Jeffrey M., Van Duyne, Richard P., and Schatz, George C.
- Subjects
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WAVE equation , *SERS spectroscopy , *SURFACE plasmon resonance , *EQUATIONS of motion , *INFRARED spectroscopy - Abstract
We present a coupled wave semiclassical theory to describe plasmonic enhancement effects in surface-enhanced femtosecond stimulated Raman scattering (SE-FSRS). A key result is that the plasmon enhanced fields which drive the vibrational equation of motion for each normal mode results in dispersive lineshapes in the SE-FSRS spectrum. This result, which reproduces experimental lineshapes, demonstrates that plasmon-enhanced stimulated Raman methods provide unique sensitivity to a plasmonic response. Our derived SE-FSRS theory shows a plasmonic enhancement of |gpu|²Im { χR(ω)g² st/Im { χR(ω)}, where |gpu|² is the absolute square of the plasmonic enhancement from the Raman pump, χR(ω) is the Raman susceptibility, and gst is the plasmonic enhancement of the Stokes field in SE-FSRS. We conclude with a discussion on potential future experimental and theoretical directions for the field of plasmonically enhanced coherent Raman scattering. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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