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http://dx.doi.org/10.3807/JOSK.2016.20.6.653

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)
Publication Information
Journal of the Optical Society of Korea / v.20, no.6, 2016 , pp. 653-662 More about this Journal
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
Complex-image technique; Method of Moments; multilayer superlens; Simulated Annealing algorithm;
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