Fluorescence Enhancement via Dual Coupling of Dye Molecules with Silver Nanostructures

We demonstrate the enhancement of fluorescence emitted from dye molecules coupled with two surface plasmons, i.e., silver nanoparticles (AgNPs)-induced localized plasmons (LSP) and thin (Ag) film supported plasmons. Excitation light is illuminated to a SiO2 layer that contains both rhodamine 110 AgNPs. AgNPs enhances excitation rates in their close proximity due LSP-induced local electromagnetic fields at wavelengths. Moreover, on one which 50 nm-thick Ag coated for metal cladding (air other surface), acts as waveguide core emission The induces couple modes, resulting waveguide-modulated version plasmon (SPCE) different thicknesses reverse Kretschmann configuration. find varying thickness modulates fluorescent signal SPCE, its modulation behavior being agreement theoretical simulation dependent properties resonance. This enables optimization engineering structure signals. combination LSP enhanced SPCE may offer chances enhancing signals highly sensitive assay biomedical chemical substances.