Three-Dimensional Visualization of Chiral Nano-Optical Field around Gold Nanoplates via Scanning Near-Field Optical Microscopy

In this study, we examine the three-dimensional chiral optical field in the vicinity of a gold nanoplate using aperture-type scanning near-field optical microscopy. Near-field imaging indicates that the chiral optical field shows a unique spatial distribution and depends on the incident polarization. We also evaluate the modal dependence of chiral optical fields, which reveals that the plasmon mode with E symmetry contributes substantially to the chiral optical field while that with A