22 September 2007 Light focusing with tip formed array of plasmon-polariton waveguides
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Abstract
We present FDTD simulations of light interaction with two dimensional silver structure made of the tip forming array of channel plasmon-polariton waveguides, that confines light to a small width beam or focus. The flat end of triangle formed plasmon-polariton waveguides array is illuminated with the optical range H-polarized Gaussian beam or plane wave. Light is transported through the structure with plasmon-polariton waves on surface of metal. At sloped planes energy from plasmon-polariton modes is refracted at an angle defined by propagation constants of modes. Propagation constants of excited plasmon-polaritons modes in waveguides array are predicted by semi-analytical calculations. Choosing canal widths, their separation and slop angle, we can couple energy from waveguides array to both free space propagation beams and to surface waves of the whole tip structure, which have propagation constants greater than free space waves. Combined effects of refraction, diffraction on the narrow end of the structure and the plasmon-polaritons like properties of surface waves on the whole structure lead to significant local enhancement of the field, high directivity of the output energy and focusing with resolution below diffraction limit for free space.
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W. M. Saj, "Light focusing with tip formed array of plasmon-polariton waveguides", Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 664120 (22 September 2007); doi: 10.1117/12.734281; https://doi.org/10.1117/12.734281
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