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Propagation properties of plasmonic micro-zone plates with and without fractals

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Abstract

Propagation properties of plasmonic micro-zone plates with and without regular fractals are calculated and analyzed. Three types of structures are presented: a plasmonic micro-zone plate with eight zones, a plasmonic micro-zone plate with a single aperture only, and a plasmonic micro-zone plate with a regular fractal (N=3, s=3). Intensity and phase distributions of the electromagnetic field for the three types of plasmonic structures were calculated by means of three-dimensional numerical computational simulation on the basis of a finite-difference and time-domain algorithm. Our computational results demonstrate that the zones play a dominant role for realizing a superfocusing with a spatial resolution beyond the diffraction limit as well as a micron-scale working distance along the propagation direction.

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Authors and Affiliations

  1. State Key Laboratory of Optical Technology for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209, P.R. China

    Y. Fu

  2. Precision Engineering and Nanotechnology Center, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore

    W. Zhou & L.E.N. Lim

Authors
  1. Y. Fu
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  2. W. Zhou
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  3. L.E.N. Lim
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Correspondence to Y. Fu.

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PACS

02.60.Cb; 42.25.Fx; 42.25.Bs

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Fu, Y., Zhou, W. & Lim, L. Propagation properties of plasmonic micro-zone plates with and without fractals. Appl. Phys. B 90, 421–425 (2008). https://doi.org/10.1007/s00340-007-2905-2

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  • DOI: https://doi.org/10.1007/s00340-007-2905-2

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