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A novel metallic elliptical nanopinholesbased pla smonic lens was put forth for the purpose of superfocusing. Systematic investigation of the lens from design to fabrication and characterization were described in this paper. Surface plasmon polaritons (SPPs) enhanced transmission is theoretically analyzed using finitedifference timedomain (FDTD) algorithmbase d computational calculation. Then the designed pattern was fabricated using focused ion beam (FIB) directly milling technique. Focusing of the lens is observed from the results of both theoretical calculation and experimental characterization using nearfield scanning optical microscope (NSOM). The experimental results are in agreement with that of the theoretical calculation. Our results demonstrated that the lens can realize subwavelength focusing with enhanced transmission, elongated focal length, and depth of focus.

Investigation of Metallic Elliptical Nano-Pinholes Structure-Based Plasmonic Lenses: From Design to Testing