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Chin. Phys. B, 2012, Vol. 21(7): 077803    DOI: 10.1088/1674-1056/21/7/077803
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Influence of polarization direction, incidence angle, and geometry on near-field enhancement in two-layered gold nanowires

Wu Da-Jiana b, Jiang Shu-Minb, Liu Xiao-Juna
a School of Physics, Nanjing University, Nanjing 210093, China;
b Faculty of Science, Jiangsu University, Zhenjiang 212013, China
Abstract  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.
Keywords:  gold nanowire      localized surface plasmon resonance      near-field enhancement     
Received:  29 January 2012      Published:  01 June 2012
PACS:  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
  78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters)  
  36.40.Vz (Optical properties of clusters)  
  73.22.Lp (Collective excitations)  
Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB921504), the National Natural Science Foundation of China (Grant Nos. 11174113, 10904052 and 11074124), and the PAPD of Jiangsu Higher Education Institutions, China.
Corresponding Authors:  Liu Xiao-Jun     E-mail:  liuxiaojun@nju.edu.cn

Cite this article: 

Wu Da-Jian, Jiang Shu-Min, Liu Xiao-Jun Influence of polarization direction, incidence angle, and geometry on near-field enhancement in two-layered gold nanowires 2012 Chin. Phys. B 21 077803

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