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APS » Journals » Phys. Rev. B » Volume 80 » Issue 11
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Phys. Rev. B 80, 113411 (2009) [4 pages]

Electron-beam mapping of plasmon resonances in electromagnetically interacting gold nanorods

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Moussa N’Gom*
Applied Physics Department and Center for Ultrafast Optical Sciences, University of Michigan—Ann Arbor, Ann Arbor, Michigan 48109, USA

Shuzhou Li and George Schatz
Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA

Rolf Erni
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 72-150, Berkeley, California 94720, USA

Ashish Agarwal and Nicholas Kotov
Chemical Engineering Department, University of Michigan—Ann Arbor, Ann Arbor, Michigan 48109, USA

Theodore B. Norris
EECS Department and Center for Ultrafast Optical Sciences, University of Michigan—Ann Arbor, Ann Arbor, Michigan 48109, USA

Received 22 March 2009; revised 11 July 2009; published 29 September 2009

Electron energy-loss spectroscopy and energy-filtered transmission electron-microscope imaging are used to characterize the energy distribution of the surface plasmon of isolated and coupled gold nanorods. Local-field enhancement and spectral shift of the plasmon modes are observed for two interacting nanoparticles. The spatial modes measured by energy loss are shown to share qualitative similarities with the electromagnetic field distribution around gold nanorods induced by optical excitation as simulated using the discrete dipole-approximation method.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.113411
DOI:
10.1103/PhysRevB.80.113411
PACS:
78.67.Bf, 07.78.+s, 02.70.Hm, 52.25.Os

*Corresponding author. mngom@umich.edu

 
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