Abstract
The transmission properties of the coherent optical signal through surface plasmon polaritons (SPPs) were investigated using a delayed self-heterodyne method. The beat spectra between the light beam through SPPs and the reference beam were observed. As the distance propagated as SPPs increases, the full width at half maximum values of the beat spectra was constant, with only decreasing peak values of the beat spectra. The retention of the coherence is also confirmed by analytical calculations based on a Drude model.
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