In this study, we explore the possibility of using plasmonic Ag nanorod arrays featuring enhanced photoemission as high-brightness photocathode material. Silver nanorod arrays are synthesized by the DC electrodeposition method and their dimensionality, uniformity, crystallinity and oxide/impurity content are characterized. These Ag nanorod arrays exhibit greatly enhanced two-photon photoemission under 400 nm femtosecond pulsed laser excitation. Plasmonic field enhancement in the array produces photoemission hot spots that are mapped using photoemission electron microscopy (PEEM). The relative photoemission enhancement of nanorod array hot spots relative to that of a flat Ag thin film is found to range between 102 and 3 x 103.
Revised: August 12, 2014 |
Published: October 14, 2013
Citation
Vilayur Ganapathy S., M.I. Nandasiri, A.G. Joly, P.Z. El-Khoury, T. Varga, G.W. Coffey, and B. Schwenzer, et al. 2013.Silver nanorod arrays for photocathode applications.Applied Physics Letters 103, no. 16:Article No. 161112.PNNL-SA-97756.doi:10.1063/1.4825262