Abstract
AbstractRaman spectroscopy is a powerful technique that enables fingerprinting of materials, molecules, and chemical environments by probing vibrational resonances. In many applications, the desired Raman signals are masked by fluorescence, either from the molecular system being studied, or from adjacent metallic nanostructures. Here, it is shown that wavelength‐modulated Raman spectroscopy provides a powerful way to significantly reduce the strength of the fluorescence background, thereby allowing the desired Raman signals to be clearly recorded. This approach is made use of to explore Raman scattering in the context of vibrational strong coupling, an area that has thus far been problematic to visualise. Specifically, strong coupling between the vibrational modes in a polymer and two types of confined light field, the fundamental mode of a metal‐clad microcavity, and the surface‐plasmon modes of an adjacent thin metal film are looked at. While clear advantages in using the wavelength‐modulated Raman approach are found, these results on strong coupling are inconclusive, and highlight the need for more work in this exciting topic area.
Highlights
Raman spectroscopy is a powerful technique that enables fingerprinting of laser light
Swamped by light produced by other processes, notably fluorescence, which can be many orders of magnitude stronger than the Raman signal
Raman spectroscopy has evolved into a powerful technique that cases, fluorescence can be so significant as to mask the desired is exploited in many areas of science, engineering, the arts, and Raman signals
Summary
These 1D arrays have been used to great effect before to study strong coupling between surface plasmons and molecules, both excitonic[46] and vibrational.[29] Further details of sample fabrication are given in Experimental Section and Supporting Information. We attribute this to the WMR data processing, and there is no physical significance associated with the sign changes seen in panels (b) and (d)
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