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In this work, we design a new tunable nanofocusing lens by the linear-variantdepths and nonlinear-variant widths of circular grating for far field practicalapplications. The constructively interference of cylindrical surface plasmonlaunched by the subwavelength metallic structure can form asubdiffraction-limited focus, and the focal length of the this structures canbe adjusted if the each groove depth and width of circular grating are arrangedin traced profile. According to the numerical calculation, the range offocusing points shift is much more than other plasmonic lens, and the relativephase of emitting light scattered by surface plasmon coupling circular gratingcan be modulated by the nonlinear-variant width and linear-variant depth. Thesimulation result indicates that the different relative phase of emitting lightlead to variant focal length. We firstly show a unique phenomenon for thelinear-variant depths and nonlinear-variant widths of circular grating that thepositive change and negative change of the depths and widths of grooves canresult in different of variation trend between relative phases and focallengths. These results paved the road for utilizing the plasmonic lens inhigh-density optical storage, nanolithography, superresolution opticalmicroscopic imaging, optical trapping, and sensing.

electromagnetic waves

Far-Field Tunable Nano-focusing Based on Metallic Slits Surrounded with  Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric  Grating