This article is cited in 2 papers

Nanofocusing

Focusing of light at the nanoapex of a metal microtip located above the plane of a dielectric or metal

A. B. Petrin

Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow

Abstract: We study the focusing of the optical electromagnetic radiation energy into a nanoscale spatial region in the vicinity of the nanoapex of a metal microtip located near a dielectric or metal plane. Focusing arises from a symmetric convergence of a surface plasmon TM wave at the nanoapex. The metal boundary near the nanoapex is approximated by a paraboloid of revolution. A numerical model, based on the method of moments, is developed to find the electric field near the tip apex. Calculation results show that, compared to a single tip, the presence of a plane leads to an additional concentration of the electric field near the nanoapex.

Keywords: nanofocusing, surface plasmons, plasmon waveguide.

Received: 14.03.2016
Revised: 09.07.2016

 English version: Quantum Electronics, 2016, 46:9, 848–854

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