Photoemission electron microscopy of a plasmonic silver nanoparticle trimer
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- Peppernick, S.J., Joly, A.G., Beck, K.M. et al. Appl. Phys. A (2013) 112: 35. doi:10.1007/s00339-012-7316-5
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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.