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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2014, 5 (5), P. 677-684

ELECTRIC FIELD ENHANCEMENT OF GOLD TIP OPTICAL ANTENNA WITH SPECIAL GEOMETRY

M. Zohrabi – Department of Optics and Nanophotonics, Institute of Physics, Kazan Federal University, Kazan, Russia; zh_als@yahoo.com

This paper provides a new design for a gold tip optical antenna based on a specic geometry, and then, the change of electric eld enhancement for plane wave laser excitation with 400 to 700 nm in the vicinity of optical antenna are simulated. Progressions of geometry incorporate the change of period of circular grating from 200-300 nm, on the shaft of antenna. In addition, the distribution of enhancement of the electric eld in a plane perpendicular to the shaft has been acquired. Finally, the optimal value for the maximum enhancement at the period of 208.843 nm is calculated.

Keywords: optical antenna, tapered gold tip, field enhancement, surface plasmon.

PACS 78.67.-n

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