Extraordinary transmission from high-gain nanoaperture antennas

摘要

This letter describes a bowtie nanoaperture antenna for coupling light to a subdiffraction limitednnear-field spot u0002u0002u0003/8u0003. The gain of the antenna is increased using a concentric grating structure toncoherently diffract normally incident light toward the aperture. We experimentally demonstrate thatnthe addition of the grating structure enhances the far-field transmission through the aperture by 6.9ntimes while the intensity at the near-field is increased more than 15 times. The nanoantenna is usefulnfor applications including nanolithography and data storage. © 2010 American Institute of Physics.nu0004doi:10.1063/1.3436726