Nanoscale Observation of Real-Space Mid-Infrared Field Distribution in a Stamp-Type Plasmonic Structure

Abstract

By utilizing a scattering-type scanning near-field optical microscopy (s-SNOM) in mid-infrared (MIR) band, we observed nanoscale real-space optical field distribution in a Bull's eye (BE) plasmonic structure, which was fabricated through a template-assisted stamp method. Nanoscale near-field images were shown to agree with plasmonic features of electromagnetic simulation results, showing that the fabricated the BE structure works as a plasmonic device. The s-SNOM thus offers a strong tool for gaining nanoscale real-space optical field distribution in plasmonic micro/nanostructures.