najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-1154Research ArticlePHYSICSФИЗИКАElectric field enhancement of gold tip optical antenna with special geometryZohrabiM.

Kazan

zh_als@yahoo.comDepartment of Optics and Nanophotonics, Institute of Physics, Kazan Federal UniversityRussian Federation20141808202555677684Copyright © Zohrabi M., 20252025Zohrabi M.Zohrabi M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1154

This paper provides a new design for a gold tip optical antenna based on a specific geometry, and then, the change of electric field 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 field 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.

optical antennatapered gold tipfield enhancementsurface plasmonThe authors wish to thank prof. R. H. Gajnutdinov, for helpful discussions. We are also grateful to Department of Optics and Nanophotonics, Kazan Federal University for giving us access to their equipment.ReferencesLukas Novotny, Palash Bharadwaj, Bradley Deutsch. Optical Antennas. Advances in Optics and Photonics, 1(3), P. 438–483 (2009).Lukas Novotny, Palash Bharadwaj, Bradley Deutsch. Optical Antennas. Advances in Optics and Photonics, 1(3), P. 438–483 (2009).T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst. Optical antennas direct singlemolecule emission. Nat. Photonics, 2, P. 234–237 (2008).T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst. Optical antennas direct singlemolecule emission. Nat. Photonics, 2, P. 234–237 (2008).V. Giannini and J. A. Sanchez-Gil. 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The authors declare that there are no conflicts of interest present.