This work was supported by the Department of Energy Basic Science office under Grant No. DE-FG02-07ER46406.
Applied Physics Letters
Photoemission, Surface plasmon resonance, Nanostructures, Electron microscopes
We use photoemission microscopy to characterize localized surface plasmon distributions in nanostructured gold layers on indium-tin-oxide/glass substrates. The Au films have a fractal dimension of ∼1.3 and smallest feature sizes of ∼100 nm. We use femtosecond laser pulses at a wavelength of ∼800 nm for the plasmon excitation. Photoelectron emission occurs by a three-photon process in localized areas of indium-tin-oxide with ∼70 nm diameter. In these areas the photoemission rate is enhanced several thousand fold compared to nonstructured surface areas. The results show that plasmon enhanced photoemission can be induced in a nonabsorbing material in proximity to a plasmon-active metal nanostructure.
Word, R. C., Dornan, T. T., & Könenkamp, R. R. (2010). Photoemission from localized surface plasmons in fractal metal nanostructures. Applied Physics Letters, 96(25), 251110