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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 23-nm-thin strips of 100--5000.3em0exnm widths placed on quartz and covered with index-matching oil are in excellent agreement with theoretical predictions.
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Søndergaard et al. (2008) studied this question.
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