Fluorescence Spectroscopy with Metal-Dielectric Waveguides.

ABSTRACT: We describe a hybrid metal-dielectric waveguide structures (MDWs) with numerous potential applications in the biosciences. These structures consist of a thin metal film coated with a dielectric layer. Depending on the thickness of the dielectric layer, the modes can be localized near the metal, within the dielectric, or at the top surface of the dielectric. The optical modes in a metal-dielectric waveguide can have either S (TE) or P (TM) polarization. The dielectric spacer avoids the quenching, which usually occurs for fluorophores within about 5 nm from the metal. Additionally, the resonances display a sharp angular dependence and can exhibit several hundred-fold increases in intensity (E²) at the silica-air interface relative to the incident intensity. Fluorophores placed on

SUBMITTER: Badugu R 

PROVIDER: S-EPMC4626214 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature