Authors: Jun Qian Chenxu Liu Wudeng Wang Jing Chen Yudong Li Jingjun Xu Qian Sun
Publish Date: 2013/02/09
Volume: 8, Issue: 2, Pages: 955-962
Abstract
The optical responses of metal nanoparticles induced by subtle variations in geometry especially by the rounding of the edges and corners have generated great interest at present due to the requirement of fabricating refined structures of metal nanoparticles and theoretical simulations of the real particles We study the effect of both inner and outer edge rounding on the optical properties of gold nanobox and gold nanobox dimer with small interparticle distances by using the discrete dipole approximation method The shift of extinction peaks the electric field distribution and the variation of refractive index sensitivities by changing the curvature of the inner and outer edges of gold nanobox are investigated We demonstrate that the optical properties of nanobox are more sensitive to the outer edge rounding than the inner edge rounding By edge rounding of two very close gold nanoboxes the blue shift of the dipolar and the quadrupolar plasmonic resonances of nanobox dimer are shown Comparing with the inner edge rounding of nanobox dimer we find that rounding of the outer edges causes the larger shift of the quadrupolar mode and approximate shift of the dipole modeThis work is supported by the National Natural Science Foundation of China 60978020 61178004 Natural Science Foundation of Tianjin 06TXTJJC13500 Program for Changjiang Scholars and Innovative Research Team in Nankai University Research Fund for the Doctoral Program of Higher Education of China 20110031120005 National Talent Training for Basic Sciences Foundation J1103208 and the Fundamental Research Funds for the Central Universities
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