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A new plasmonic nanolens that can be tuned by varying the circular structure into an elliptical annulus and the aspect ratio from 1 to 0.1 and 1 to 2,respectively,is proposed.Using the rigorous finite-difference and time-domain algorithm,we find that when the aspect ratio ranges from 1 to 0.1,a good linear relationship exists between the aspect ratio and focusing spot size at the full-width at half-maximum in the x- and y-directions,respectively.The corresponding calculated FWHM ranges from 96×126(nm) to 15×52(nm)(Full Width at Half Maximum).
A new plasmonic nanolens that can be tuned by varying the circular structure into an elliptical annulus and the aspect ratio from 1 to 0.1 and 1 to 2, respectively, is proposed. Using the rigorous finite-difference and time-domain algorithm, we find that when the aspect ratio ranges from 1 to 0.1, a good linear relationship exists between the aspect ratio and focusing spot size at the full-width at half-maximum in the x- and y-directions, respectively. These calculated FWHM ranges from 96 × 126 (nm) to 15 × 52 (nm) (Full Width at Half Maximum).