Circularly polarized nanoring antenna for uniform overheating applications

Author's Department

Physics Department

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Document Type

Research Article

Publication Title

Microwave and Optical Technology Letters

Publication Date





A nanoring antenna is introduced for the first time in this article. This nantenna is made by etching a slot ring in a nanogold plate. The proposed nantenna can be easily tuned for operation at any wavelength of interest by varying the diameter of its ring. The proposed nantenna has a pair of hot-spots that are aligned opposite to each other along a line passing through the center of the nanoring. The electric field intensity enhancement at the hot-spots of the proposed nantenna is more than 2000 with a full-width at half-maximum of about 900 nm centered around 2500 nm wavelength. If excited with circularly polarized plane wave, the hot-spots pair is rotating with time. This unique feature of the new nanoring makes it very attractive for cancer tumor overheating, as it allows for more uniform distribution of the concentrated heat than any other nantenna with fixed hot-spot location. The proposed nantenna is thoroughly analyzed by means of two well-known 3D electromagnetic solvers that agree very well with each other. The effect of varying the substrate refractive index below the nantenna is also investigated. Copyright © 2012 Wiley Periodicals, Inc.

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