Abstract
We demonstrate resonant slot nanoantennas on Ag film for surface plasmon (SP) radiation in optical frequency range. Radiation spectra of the nanoantennas and resonant mode patterns for different mode orders with high spatial resolution are obtained using cathodoluminescence spectroscopy. The dispersions are obtained from the experimental data, and the far-field angular distributions of the radiation are simulated for the four lowest modes. The nanoantennas, which can realize resonant conversion between free space light and SPs at nanoscale, should find applications in nanophotonic devices and integrated optical circuits.
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