Plasmonic color filter with nanoring aperture array

Abstract. The plasmonic color filter with sub-wavelength nanometal structure has the advantages that the traditional organic dye color filter cannot replace because of its unique characteristics. However, most plasmonic color filters have low selectivity and weak resonance. It limits their further applications and accuracy. We introduce a plasmonic color filter with a nanoring aperture array, which can exhibit high resonance intensity by fine-tuning the size of the outer aperture and the array period. Through COMSOL Multiphysics comprehensive verification, this may be potentially useful in micro- and nanodetection, optical imaging, optical filters, and other fields.