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  Journal of Nanoscience Letters. Volume 1, Issue 2 (2011) pp. 109-115
  Research Article
The effect of longitude polarization on the transverse local field enhancement in gold nanotube
  Fan-kang Lia,b, Jian Zhua,b  
a The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
b Department of optical information science and technology, School of Science, Xi’an Jiaotong University, Xi’an 710049, China

  By using discrete dipole approximation (DDA) method, we study the dipolar local field polarization in a finite length gold nanotube with the incident polarization parallel to the tube. It is interesting to find that the longitude surface plasmon resonance (SPR) can influence the distribution of the electric field (E-field) intensity at the traverse section. Moreover the distribution of the local E-field intensity at traverse section is tunable by the variance of aspect ratio (AR) of the gold tube, which can be manifested by the variation of the hot spots in the inner and outer surface. Although increasing the AR leads to the increase of local field intensity at both inner and outer surface, the increasing degree of inner surface field is much weaker than that of outer surface, which results in the contrast of the E-field intensity of them. All these results can be ascribed to the variation of the charge distribution in the tube, impacted by the increase of the repelling force from the opposite wall and the decrease of attraction force from the diagonal end of the tube as the AR increases. This study also indicates that the interaction of polarized charges at different interface and direction of a non-spherical symmetric metallic core-shell nanostructure can bring us more plentiful plasmon coupling and more tunable local field enhancement.
  Surface plasmon resonance; Gold nanotube; Aspect ratio; Local electric field  

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