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No Access Submitted: 09 April 2010 Accepted: 04 June 2010 Published Online: 25 June 2010

  • Photoemission from localized surface plasmons in fractal metal nanostructures

Appl. Phys. Lett. 96, 251110 (2010); https://doi.org/10.1063/1.3457921
R. C. Word, T. Dornan, and R. Könenkampa)
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  • R. C. Word
  • T. Dornan
  • R. Könenkamp
ABSTRACT
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.
This work was supported by the Department of Energy Basic Science office under Grant No. DE-FG02-07ER46406. T. Dornan acknowledges support from the Oregon Nano and Microtechnologies Institute, ONAMI.

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  1. © 2010 American Institute of Physics.

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