Optical nanorod antennas as dispersive one-dimensional Fabry–Pérot resonators for surface plasmons

Resonant optical nanoantennas exhibit a different length scaling due to the surface plasmons compared to their radio frequency counterparts. In this letter, we address this difference by calculating the wavelength-dependent effective mode index neff for a cylindrical one-dimensional gold nanowire waveguide. Our results show that nanorod optical antennas act as dispersive and lossy Fabry–Perot resonators for surface plasmons.

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