Extraordinary Focusing Effect of Surface Nanolenses in Total Internal Reflection Mode.

ABSTRACT: Microscopic lenses are paramount in solar energy harvesting, optical devices, and imaging technologies. This work reports an extraordinary focusing effect exhibited by a surface nanolens (i.e., with at least one dimension of subwavelength) that is situated in an evanescent field from the total internal reflection (TIR) of light illuminated to the supporting substrate above the critical angle. Our measurements show that the position, shape, and size of the surface area with enhanced light intensity are determined by the geometry of the nanolens and the incident angle, in good agreement with simulation results. This strong focusing effect of the surface nanolens is shown to significantly promote the plasmonic effect of deposited gold nanoparticles on the lens surface inlight conversion and t

SUBMITTER: Dyett B 

PROVIDER: S-EPMC6276033 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature