Advances and Challenges in Optical Molecular Spectroscopy Including Surface Plasmon Resonance‐Based Methods for Bioanalysis

Excitation Wavelength Dependence of Combined Surface- and Graphene-Enhanced Raman Scattering Experienced by Free-Base Phthalocyanine Localized on Single-Layer Graphene-Covered Ag Nanoparticle Arrays

“…One of the primary as well as persistent stimuli for design, preparation, and applications of hybrid systems constituted by plasmonic metal nanostructures (NSs) and chromophoric molecules is a possibility to combine the molecular resonance enhancement of Raman scattering of the chromophores with the enhancement of both the incident and the Raman scattered radiation by the resonance excitation of surface plasmons localized on the NSs, followed by the resulting dipole emission, that is, with the electromagnetic (EM) mechanism of surface-enhanced Raman scattering (SERS), giving rise to surface-enhanced resonance Raman scattering (SERRS). − The design of such hybrid systems has been targeted on the most efficient coupling of the two enhancement mechanisms upon preservation of the native structure of the chromophores, which, in some cases, can be perturbed by the direct chromophore–metal NS interaction. , It has been demonstrated that separation of the chromophore from the metal NS by insertion of a thin molecular spacer into the hybrid system can lead to the fulfillment of both goals: preservation of the native structure of the chromophore without a loss in the overall SERRS enhancement by a molecular resonance damping. − …”