We
study surface-enhanced Raman scattering (SERS) in fully dielectric
periodic structures supporting Bloch surface waves. We demonstrate
a lower bound for the SERS enhancement of 50 when the optical pump
is resonantly coupled to the Bloch surface wave supported by the structure.
A corresponding photoluminescence experiment shows an emission enhancement
of more than two orders of magnitude, suggesting that the actual SERS
enhancement is ∼200. Analogous conclusions are obtained by
means of a semiclassical theoretical model. These results suggest
an alternative to plasmonic materials to enhance Raman scattering
at a surface and are of interest to those working in the field of
Raman as well as fluorescence spectroscopy.
We perform a systematic study of spontaneous Raman scattering in resonant planar structures. We present a semiclassical approach that allows the description of spontaneous Raman scattering in an arbitrary multilayer, providing analytical expressions of the Raman cross sections in terms of the Fresnel coefficients of the structure and taking into account beam size effects. Large enhancements of the Raman cross section are predicted in fully dielectric structures. In particular, given our results, truncated periodic multilayers supporting Bloch surface waves might be of interest for the realization of integrated Raman sensor devices.
We present a new strategy, based on a Fresnel coefficient pole analysis, for designing an asymmetric multilayer structure that supports long range surface plasmons (LRSP). We find that the electric field intensity in the metal layer of a multilayer LRSP structure can be even slightly smaller than in the metal layer of the corresponding symmetric LRSP structure, minimizing absorption losses and resulting in LRSP propagation lengths up to 2mm. With a view towards biosensing applications, we also present semi-analytic expressions for a standard surface sensing parameter in arbitrary planar resonant structures, and in particular show that for an asymmetric structure consisting of a gold film deposited on a multilayer of SiO2 and TiO2 a surface sensing parameter G = 1.28nm −1 can be achieved.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.