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Published December 2007 | public
Journal Article

Plasmonic Modes of Annular Nanoresonators Imaged by Spectrally Resolved Cathodoluminescence


We report the observation of plasmonic modes of annular resonators in nanofabricated Ag and Au surfaces that are imaged by spectrally resolved cathodoluminescence. A highly focused 30 keV electron beam is used to excite localized surface plasmons that couple to collective resonant modes of the nanoresonators. We demonstrate unprecedented resolution of plasmonic mode excitation and by combining these observations with full-field simulations find that cathodoluminescence in plasmonic nanostructures is most efficiently excited at positions corresponding to antinodes in the modal electric field intensity.

Additional Information

© 2007 American Chemical Society. Received 23 July 2007. Published online 14 November 2007. Published in print 1 December 2007. This work has benefited from numerous discussions with colleagues, including T. van Wijngaarden, J. Dionne, R. Walters, J. Biteen, D. Hofmann, E. Verhagen, and R. de Waele. We acknowledge financial support from the Air Force Office of Scientific Research under MURI Grant FA9550-04-1-0434. This work is also part of the research program of the FOM, financially supported by the NWO. CL measurements were performed using facilities of the Amsterdam nanoCenter. C.E.H. acknowledges fellowship support from the National Science Foundation and the Department of Defense.

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October 26, 2023