中国物理B ›› 2012, Vol. 21 ›› Issue (7): 77803-077803.doi: 10.1088/1674-1056/21/7/077803
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
吴大建a b, 蒋书敏b, 刘晓峻a
Wu Da-Jian(吴大建)a)b), Jiang Shu-Min(蒋书敏)b), and Liu Xiao-Jun(刘晓峻)a)†
摘要: The influences of polarization direction, incidence angle, and geometry on the near-field enhancements in two-layered gold nanowires (TGNWs) have been investigated by using the vector wave function method. When the polarization direction is perpendicular to the incidence plane, the local field factor (LFF) in TGNW decreases first and then increases with the increase of the incidence angle. The minimum LFF is observed at the incidence angle of 41?. It is found that the increase of the dielectric constant of the inner core leads to the decrease of LFF. With the increase of the inner core radius, the LFF in TGNW increases first and then decreases, and the maximum LFF is observed at the inner core radius of 27 nm. On the other hand, when the polarization direction is parallel to the incidence plane, the collective motions of the induced electrons are enhanced gradually with the decrease of the incidence angle, and hence the near-field enhancement is increased.
中图分类号: (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)