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Surface Plasmon-Based Pulse Splitter and Polarization Multiplexer
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posted on 2018-10-11, 13:19 authored by Alan G. Joly, Yu Gong, Patrick Z. El-Khoury, Wayne P. HessSurface plasmon polaritons (SPPs)
launched from a protruded silver
spherical cap structure using s-polarized femtosecond
laser excitation are investigated using photoemission electron microscopy.
The resulting SPP is comparable in intensity to SPPs launched with p-polarized excitation but propagates with a distinct spatial
profile. The spatial and temporal properties of the nascent SPP are
determined by splitting the femtosecond pulse into a spatially separated
pump–probe pair of orthogonal polarizations. The s-polarized pump pulse initiates the SPP, which is then visualized
by the photoelectron emission induced by a spatially and temporally
separated p-polarized probe pulse. The s-polarization launched SPP displays a bifurcated spatial structure
with an antisymmetric mirror plane and may be regarded as two spatially
distinct, temporally phase-locked wave packets. Significantly, the
wave packets are one-half period out of phase with each other governed
by the phase of the driving laser field. Finite difference time domain
calculations corroborate the experimental results. The resulting SPP
can be utilized for either polarization multiplexing or as a pulse
splitter in nanophotonic circuits.
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wave packetsantisymmetric mirror planephase-locked wave packetsorthogonal polarizationsFinite difference time domain calculationsPolarization Multiplexer Surface plasmon polaritonspulse splitterSPP displayslaser fieldfemtosecond laser excitationpolarization multiplexingphotoelectron emissionprobe pulsenanophotonic circuitsone-half periodcap structureSurface Plasmon-Based Pulse Splitterphotoemission electron microscopyfemtosecond pulse
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