Two-photon mapping of localized field enhancements in thin nanostrip antennas

I. Beermann, S.M. Novikov, Thomas Søndergaard, Alexandra Boltasseva, S.I. Bozhevolnyi

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Resonant scattering and local field enhancements by 11-nm-thin gold nanostrip antennas due to constructive interference of counter propagating slow surface plasmon polaritons is investigated. We characterize nanostrips of widths between 50-530 nm using both reflection spectroscopy and nonlinear scanning optical microscopy, in which two-photon-excited photoluminescence (TPL) excited with a strongly focused laser beam at the wavelength 745 nm is detected. We use TPL images to map the local field enhancements from individual nanostrips at a resolution of 0.35µm and compare results with theoretical calculated reflection spectra, enhancement levels and field distributions across the strip.

© 2008 Optical Society of America
Original languageEnglish
JournalOptics Express
Volume16
Issue number22
Pages (from-to)17302-17309
ISSN1094-4087
DOIs
Publication statusPublished - 2008

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