锥形镀膜光纤探针近场分布特性  

THE NEAR-FIELD PROPERTIES OF THE METAl-COATED FIBER PROBE

作　　者：韩俊玲[1] 邹倩[1] 滕树云[1] 董庆瑞[1] 程传福[1] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014

出　　处：《山东师范大学学报（自然科学版）》2006年第3期61-63,共3页Journal of Shandong Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(69978012)

摘　　要：采用三维时域有限差分法对锥形镀膜光纤探针的近场分布特性进行了研究,结果表明入射光照射到探针上出现了退极化现象,光纤探针的近场分布不具有圆周对称性,探针的纵向截面中,与入射偏振光垂直的截面和与入射偏振光平行的截面两者的近场分布差异较大.在其它光纤探针参量相同的情况下对不同锥角的光纤探针进行了计算和比较,结果表明锥角越大从探针尖端出射的光强越大,从光波波导的角度对这种现象进行了分析.The near-field distributions of tapered metal-coated optical fiber probe are characterized based on the 3D finite-difference time-domain （FDTD）. The calculation result reveals that the polarized incident light becomes depolarized after emitting from the small aperture of the probe. The near-field distributions of the probe are unsymmetrical, and the near-field distributions of the cross section vertical to the polarized wave are different from that of the cross section parallel to the polarized wave. The relationship between the electric-field magnitude and the taper angle is calculated, keeping other parameters unalterable. It reveals that the larger the taper angle is, the greater the electric-field magnitude is. We analyze this phenomenon in terms of the light waveguide.

关 键 词：时域有限差分法 光纤探针 近场光学 

分 类 号：O434.12[机械工程—光学工程]