Giant Enhancement of Transmitted Light and Its Localization Due to Elastic Surface Plasmon-Polariton Scattering by a Thin Dielectric Diffraction Grating

摘要

The enhancement factor for surface plasmon- polaritons scattering by a thin dielectric grating was measured experimentally. Scattering of a p-polarized wave may be up to 30,000 times stronger than the non-resonant scattering of an s - polarized wave by the same grating. A detailed comparison between the theoretical calculations and experimental measurements was performed. Strong localization of the scattered field near the edges of diffraction grating grooves was found. Such localization is very promising for numerous applications, e.g., biological sensors, optical tweezers for catching particles, or viruses, etc.