Photoemission electron microscopy of a plasmonic silver nanoparticle trimer
We present a combined experimental and theoretical study to investigate the spatial distribution of photoelectrons emitted from silver-coated polystyrene nanoparticles. We use two-photon photoemission electron microscopy (2P-PEEM) to image electron emission from a silver-capped aggregate trimer. Finite difference time domain (FDTD) simulations are performed to model the intensity distributions of the electromagnetic near fields resulting from femtosecond laser excitation of localized surface plasmon oscillations in the trimer structure. We demonstrate that the predicted FDTD near-field intensity distribution reproduces the 2P-PEEM photoemission pattern.
KeywordsLocalize Surface Plasmon Resonance Extinction Spectrum Finite Difference Time Domain Shell Particle Polystyrene Sphere
The authors were supported by the Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences. Pacific Northwest National Laboratory is operated for the U.S. Department of Energy by Battelle. The research was performed using EMSL, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research located at Pacific Northwest National Laboratory. J.W., Y.W. and W.D.W. acknowledge the support from the NSF CCI Center for Nanostructured Electronic Materials under Award No. CHE-1038015. W.D.W. acknowledges and appreciates the generous support from ORAU for the Ralph E. Powe Junior Faculty Enhancement Award, Sigma Xi for the Junior Faculty Research Award from the Florida Chapter and the University of Florida for startup assistance. Materials fabrication and characterization were conducted at Nanoscale Research Facility (NRF) and Major Analytical Instrumentation Center (MAIC) at UF. 2P-PEEM measurement was performed using the EMSL through a user proposal (No. 40065).
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