25 March 2015 Lightning-rod effect near sharp dielectric structures
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Proceedings Volume 9533, Optical Technologies for Telecommunications 2014; 95330A (2015) https://doi.org/10.1117/12.2180353
Event: Optical Technologies for Telecommunications 2014, 2014, Kazan, Russian Federation
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.
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Sergey A. Degtyarev, Sergey A. Degtyarev, Svetlana N. Khonina, Svetlana N. Khonina, Andrew V. Ustinov, Andrew V. Ustinov, Nicolay L. Kazanskiy, Nicolay L. Kazanskiy, "Lightning-rod effect near sharp dielectric structures", Proc. SPIE 9533, Optical Technologies for Telecommunications 2014, 95330A (25 March 2015); doi: 10.1117/12.2180353; https://doi.org/10.1117/12.2180353
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