Tuning the focusing spot of plasmonic nanolens by aspect ratio under linear polarization  

作　　者：曹水艳 鱼卫星 王成 付永启 

机构地区：[1]State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]School of Physical Electronics,University of Electronic Science and Technology of China

出　　处：《Chinese Optics Letters》2014年第1期62-65,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.90923036,60977041,60877021,and 61077010);the 100 Talents Program of Chinese Academy of Sciences,and the Ministry of Science and Technology of China(No.2010DFR10660)

摘　　要：A new plasmonic nanolens that can be tuned by varying the circular structure into an elliptical annulus and the aspect ratio from l 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 z- 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 l 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 z- and y-directions, respectively. The corresponding calculated FWHM ranges from 96 × 126 （nm） to 15× 52 （nm） （Full Width at Half Maximum）.

关 键 词：PLASMONS Time domain analysis 

分 类 号：TN25[电子电信—物理电子学]