Efficient unidirectional ridge excitation of surface plasmons

Author

• I P. Radko, Institute of Sensors, Signals and Electrotechnics, University of Southern Denmark
• S I. Bozhevolnyi, Institute of Sensors, Signals and Electrotechnics, University of Southern Denmark
• G Brucoli, Instituto de Ciencia de Materiales de Arag ´ on and Departamento de F´ısica de la Materia Condensada
• L Mart´ın-Moreno, Instituto de Ciencia de Materiales de Arag ´ on and Departamento de F´ısica de la Materia Condensada
• F J. Garc´ıa-Vidal, Departamento de F´ısica Te ´ orica de la Materia Condensada, Universidad Aut ´ onoma de Madrid
• A Boltasseva, Birck Nanotechnology Center, Purdue UniversityFollow

Abstract

Using leakage-radiation microscopy, we characterize the efficiency of unidirectional surface-plasmon excitation with periodic (800 nm) arrays of 130-nm-high and 330-nm-wide gold ridges on a thin gold film illuminated with a focused (5-mu m-wide) laser beam. We demonstrate that, at the resonant wavelength of 816 nm, the excitation efficiency of > 0.4 can be obtained with >= 5 ridges by adjusting the beam position. Conducting numerical simulations, we account for the experimental results and calculate the electric-field enhancement achieved near the gold surface.

Keywords

POLARITON; LIGHT

Citation

27 April 2009 / Vol. 17, No. 9 / OPTICS EXPRESS 7228

Date of this Version

4-27-2009

Recommended Citation

Radko, I P.; Bozhevolnyi, S I.; Brucoli, G; Mart´ın-Moreno, L; Garc´ıa-Vidal, F J.; and Boltasseva, A, "Efficient unidirectional ridge excitation of surface plasmons" (2009). Birck and NCN Publications. Paper 385.
https://docs.lib.purdue.edu/nanopub/385