Plexciton in tip-enhanced resonance Stokes and anti-Stokes Raman spectroscopy and in propagating surface plasmon polaritons

Abstract

Abstract New methods to improve the properties of surface-enhanced Raman scattering and propagating surface plasmon polaritons (PSPPs) are desirable. In this study, we theoretically employ the plasmon–exciton (plexciton) interaction to enhance the spectra in localized surface plasmon (LSP) and PSPP. The tip-enhanced resonance Raman spectroscopy (TERRS) configuration is used to enhance both Stokes and anti-Stokes Raman spectra of rhodamine 6G simultaneously. We achieve a huge enhancement factor of 1013 ∼ 1015. Furthermore, we obtain the plexciton by employing the Ag nanowire coated with rhodamine 6G, which improves the propagation properties.