Chinese Optics Letters, 2014, 12 (1): 012401, Published Online: Jan. 10, 2014
Tuning the focusing spot of plasmonic nanolens by aspect ratio under linear polarization Download: 537次
240.6680 Surface plasmons 310.6628 Subwavelength structures,nanostructures 000.4430 Numerical approximation and analysis 350.5730 Resolution
Abstract
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 \times 52 (nm) (Full Width at Half Maximum).
Shuiyan Cao, Weixing Yu, Cheng Wang, Yongqi Fu. Tuning the focusing spot of plasmonic nanolens by aspect ratio under linear polarization[J]. Chinese Optics Letters, 2014, 12(1): 012401.