Abstract We theoretically investigate the transmission spectra and the field distributions with different defects in the gold nanotube arrays by using the finite-difference time-domain method. It is found that the optical properties of the nanotube arrays are strongly influenced by different defects. When there are no defects in the central nanotube, the values of peaks located at both sides of photonic band gap have their maxima. Based on the distributions of electric field component Ex and the total energy distribution of the electric and the magnetic field, we show that there exhibits mainly a dipole field distribution for the plasmon mode at the long-wavelength edge of the band gap but higher order modes of the composite are excited at the short-wavelength edge of the band gap. The plasmon resonant modes can also be controlled by introducing defects.
(Electronic transport in nanoscale materials and structures)
Fund: Project supported by the Scientific Research Foundation of Hunan Provincial Education Department, China (Grant Nos. 11C0425 and 09C314), the Natural Science Foundation of Hunan Province, China (Grant No. 10JJ3088), the Major Program for the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 10A026),and the National Natural Science Foundation of China (Grant No. 11164007).
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