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Proceedings Paper

Lightning-rod effect near sharp dielectric structures
Author(s): Sergey A. Degtyarev; Svetlana N. Khonina; Andrew V. Ustinov; Nicolay L. Kazanskiy
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Paper Abstract

We consider nanofocusing of electromagnetic field in the near-field using sharp metallic and dielectric particles with little radius of surface curvature. An ability of extraordinary field confinement is shown theoretically using integral equations and modelling in Comsol. We have offered the scheme of focusing, which consists of prefocuser and nanofocuser. We consider different composition of prefocuser and nanofocuser. It is shown that a size of a focal spot extremely depends on radius of surface curvature. A refractive axicon can be used as prefocuser and metal or silicon nanoparticle can be used as nanofocuser. If the radius of aluminum spherical nanofocuser is 20 nm the radius of the focal spot is λ 400 . That is smaller than it is achieved in previous works.

Paper Details

Date Published: 25 March 2015
PDF: 6 pages
Proc. SPIE 9533, Optical Technologies for Telecommunications 2014, 95330A (25 March 2015); doi: 10.1117/12.2180353
Show Author Affiliations
Sergey A. Degtyarev, Samara State Aerospace Univ. (Russian Federation)
Image Processing Systems Institute (Russian Federation)
Svetlana N. Khonina, Samara State Aerospace Univ. (Russian Federation)
Image Processing Systems Institute (Russian Federation)
Andrew V. Ustinov, Samara State Aerospace Univ. (Russian Federation)
Image Processing Systems Institute (Russian Federation)
Nicolay L. Kazanskiy, Samara State Aerospace Univ. (Russian Federation)
Image Processing Systems Institute (Russian Federation)


Published in SPIE Proceedings Vol. 9533:
Optical Technologies for Telecommunications 2014
Vladimir A. Andreev; Vladimir A. Burdin; Albert H. Sultanov; Oleg G. Morozov, Editor(s)

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