Plasmon resonance coupling in strongly coupled gold nanotube arrays with structural defects

doi:10.1088/1674-1056/21/8/084202

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 E_x 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.

Keywords: structural defect transmission spectra gold nanotube array field distributions

Received: 11 January 2012
Revised: 17 February 2012
Accepted manuscript online:

PACS:	42.25.Bs	(Wave propagation, transmission and absorption)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	73.63.-b	(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).

Corresponding Authors: Zhou Xin
E-mail: xzhou522@ yahoo.com.cn

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Zhou Xin (周昕), Fang Jian-Shu (方见树), Yang Di-Wu (杨迪武), Liao Xiang-Ping (廖湘萍 ) Plasmon resonance coupling in strongly coupled gold nanotube arrays with structural defects 2012 Chin. Phys. B 21 084202

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Plasmon resonance coupling in strongly coupled gold nanotube arrays with structural defects

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