We study an optical response of a system of two parallel close metallic cylinders having nanoscale dimensions. Surface plasmon excitation in the gap between the cylinders is specifically analyzed. In particular, resonance frequencies and field enhancement were investigated as functions of geometrical characteristics of the system and ohmic losses in the metal. The results of numerical simulations were systematically compared with the analytical theory, obtained in the quasi-static limit. The analytical method was generalized in order to take into account the retardation effects. We also present the physical qualitative picture of the plasmon modes, which is validated by numerical simulations and analytical theory.
© 2012 Optical Society of America
Optics at Surfaces
Original Manuscript: January 27, 2012
Revised Manuscript: March 16, 2012
Manuscript Accepted: March 19, 2012
Published: May 17, 2012
Viktoriia E. Babicheva, Sergey S. Vergeles, Petr E. Vorobev, and Sven Burger, "Localized surface plasmon modes in a system of two interacting metallic cylinders," J. Opt. Soc. Am. B 29, 1263-1269 (2012)