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Two-Dimensional Sub-diffraction-limited Imaging by an Optimized Multilayer Superlens

  • Ahmadi, Marzieh (School of Electrical and Computer Engineering, Tarbiat Modares University) ;
  • Forooraghi, Keyvan (School of Electrical and Computer Engineering, Tarbiat Modares University) ;
  • Faraji-Dana, Reza (School of Electrical and Computer Engineering, University of Tehran) ;
  • Ghaffari-Miab, Mohsen (School of Electrical and Computer Engineering, Tarbiat Modares University)
  • Received : 2016.05.20
  • Accepted : 2016.10.12
  • Published : 2016.12.25

Abstract

An optimized multilayer superlens is designed, using a rigorous and efficient approach based on the method of moments (MoM) in conjunction with a simulated annealing (SA) algorithm. For the MoM solution, fast evaluation of closed-form Green's functions (GFs) in the spatial domain is performed by applying the complex-image (CI) technique, which obviates the time-consuming numerical evaluation of Sommerfeld integrals. The imaging capability of the superlens is examined with the correlation coefficient; results show that using circular polarization for the incident wave can improve this coefficient. To validate the proposed method, finite-element-based simulations are exploited, which reveal the method's accuracy and computational efficiency. Simulation results indicate that the designed structure is capable of producing two-dimensional sub-diffraction-limited images in the visible range, which may make it more versatile for practical applications. Finally, as a considerable finding, it is demonstrated for the proposed design that using circularly polarized illumination provides improved super-resolving performance, compared to linearly polarized illumination.

Keywords

References

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