Open AccessTwo-photon mapping of localized field enhancements in thin nanostrip antennas
Author(s) -
Jonas Beermann,
Sergey M. Novikov,
Thomas Søndergaard,
Alexandra Boltasseva,
Sergey I. Bozhevolnyi
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.017302
Subject(s) - optics , materials science , plasmon , spectroscopy , excited state , surface plasmon , surface plasmon polariton , reflection (computer programming) , photoluminescence , scattering , thin film , polariton , optoelectronics , physics , atomic physics , quantum mechanics , computer science , programming language , nanotechnology
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 0.35 microm and compare results with theoretical calculated reflection spectra, enhancement levels and field distributions across the strip.