In this Letter, we report on dark field imaging of localized surface plasmon polaritons (SPPs) in plasmonic waveguiding bands formed by plasmonic coupled cavities. We image the light scattered from SPPs in the plasmonic cavities excited by a tunable light source. Tuning the excitation wavelength, we measure the localization and dispersion of the plasmonic cavity mode. Dark field imaging has been achieved in the Kretschmann configuration using a supercontinuum white-light laser equipped with an acoustooptic tunable filter. Polarization dependent spectroscopic reflection and dark field imaging measurements are correlated and found to be in agreement with finite-difference time-domain calculations.
© 2011 Optical Society of America
Optics at Surfaces
Original Manuscript: June 27, 2011
Revised Manuscript: August 4, 2011
Manuscript Accepted: August 4, 2011
Published: August 26, 2011
Sinan Balci, Ertugrul Karademir, Coskun Kocabas, and Atilla Aydinli, "Direct imaging of localized surface plasmon polaritons," Opt. Lett. 36, 3401-3403 (2011)