We present a combined experimental and theoretical study to investigate the spatial distribution of photoelectrons emitted from core-shell silver (Ag) nanoparticles. We use two-photon photoemission microscopy (2P-PEEM) to spatially resolve electron emission from a trimeric core-shell aggregate of triangular symmetry. Finite difference time domain (FDTD) simulations are performed to model the intensity distributions of the electromagnetic near-fields resulting from femtosecond (fs) laser excitation of localized surface plasmon oscillations in the triangular core-shell structure. We demonstrate that the predicted FDTD near-field intensity distribution reproduces the 2P-PEEM photoemission pattern.
Revised: July 3, 2013 |
Published: July 1, 2013
Citation
Peppernick S.J., A.G. Joly, K.M. Beck, W.P. Hess, J. Wang, Y. Wang, and W. Wei. 2013.Photoemission Electron Microscopy of a Plasmonic Silver Nanoparticle Trimer.Applied Physics A, Materials Science and Processing 112, no. 1:35-39.PNNL-SA-84162.doi:10.1007/s00339-012-7316-5