Abstract
Resonant scattering by gold nanostrip antennas due to constructive interference of counterpropagating slow surface plasmon polaritons (SPPs) is analyzed, including the quasistatic limit of ultrasmall antennas, and experimentally demonstrated. The phase of slow SPP reflection by strip ends is found from scattering spectra revealing the influence of non-SPP field components. Experimental scattering spectra of gold 17- and -thin strips of widths placed on quartz and covered with index-matching oil are in excellent agreement with theoretical predictions.
- Received 13 November 2007
DOI:https://doi.org/10.1103/PhysRevB.77.115420
©2008 American Physical Society