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Universal Aspects of Ultrafast Optical Pulse Scattering by a Nanoscale Asperity

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posted on 12.09.2013, 00:00 by Lingxiao Zhang, Atsushi Kubo, Leiming Wang, Hrvoje Petek, Tamar Seideman
We combine photoemission electron microscopy and electromagnetic simulations to describe the surface plasmon polariton dynamics following interaction of an ultrafast optical pulse with a slit coupling structure in a silver film. Through analysis of interference phenomena that lead to photoelectron emission from the silver film, we establish the universal contributions of a nanoscale asperity to the scattered surface field. Our results reveal the important role of surface cylindrical waves within the slit in the excitation of surface plasmon.