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Phys Rev Lett. 2009 May 22;102(20):207402. Epub 2009 May 20.

Proposal for superfocusing at visible wavelengths using radiationless interference of a plasmonic array.

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  • 1Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia, V8P 5C2, Canada.


Radiationless electromagnetic interference has been proposed to focus light below the diffraction limit. This has been demonstrated for microwave wavelengths; however, those approaches cannot be extended directly to visible wavelengths due to the material response and limitations from nanofabrication. In this Letter, a different approach is proposed to enable subdiffraction-limit focusing in the visible. The approach is based on the highest-order mode of a metal-dielectric waveguide array. Comprehensive simulations of focusing are provided for two different extreme examples: a structure that gives a 0.21 wavelength focus spot at a relatively large distance of 0.5 wavelength, and a sharp 0.057 wavelength focus spot at distance of 0.1 wavelength. The proposed nanostructures are comparable to those found in recent experiments.

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