Effect of dipole location on profile properties of symmetric surface plasmon polariton mode in Au/Al<sub>2</sub>O<sub>3</sub>/Au waveguide

doi:10.1007/s12200-012-0184-y

Front Optoelec

2012, Vol. 5

Issue (1) : 63-67 https://doi.org/10.1007/s12200-012-0184-y

RESEARCH ARTICLE

Effect of dipole location on profile properties of symmetric surface plasmon polariton mode in Au/Al₂O₃/Au waveguide

Gongli XIAO^1,2, Xiang JI¹, Linfei GAO¹, Xingjun WANG¹, Zhiping ZHOU¹(

)

1. The State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China; 2. Information and Communications College, Guilin University of Electronic Technology, Guilin 541004, China

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Abstract

This study uses a dipole embedded in Al₂O₃ layer to excite a symmetric surface plasmon polariton (SPP) mode in Au/Al₂O₃/Au waveguide to investigate its profile properties by using finite-difference time-domain (FDTD) method. The excited dipole decay radiatively direct near-field coupling to SPP mode owing to thin Al₂O₃ layer of 100 nm. The effects of electric and magnetic field intensity profiles and decay length have been considered and characterized. It is found that dipole location is an important factor to influence the horizontal and vertical profile properties of symmetric SPP mode in Au/Al₂O₃/Au waveguide. The amplitudes of electric and magnetic field intensity and the wavelengths of metal-insulator-metal (MIM) SPP resonance mode can be tuned by varying dipole location. The horizontal and vertical decay lengths are 19 and 24 nm, respectively. It is expected that the Au/Al₂O₃/Au waveguide structure is very useful for the practical applications of designing a SPP source.

Keywords waveguide surface plasmon polariton (SPP) profile properties

Corresponding Author(s): ZHOU Zhiping,Email:zjzhou@pku.edu.cn

Issue Date: 05 March 2012

Cite this article:

Gongli XIAO,Xiang JI,Linfei GAO, et al. Effect of dipole location on profile properties of symmetric surface plasmon polariton mode in Au/Al₂O₃/Au waveguide[J]. Front Optoelec, 2012, 5(1): 63-67.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0184-y
https://academic.hep.com.cn/foe/EN/Y2012/V5/I1/63

Fig.1 Schematic structure of proposed Au/AlO/Au waveguide composed of two identical Au films separated by an insulator layers AlO, and a dipole is embedded in AlO layer to excite a MIM SPP mode for forward propagating

Fig.2 (a) Horizontal profiles of electric field (E) intensity at bottom AlO/Au interface as a function of dipole distance; (b) electric (E) field peak intensity and SPP resonance wavelength as function of dipole distance

Fig.3 (a) Horizontal profiles of magnetic field (H) intensity at bottom AlO/Au interface as function of dipole distance; (b) magnetic field (H) peak intensity and SPP resonance wavelength as function of dipole distance

Fig.4 Vertical profiles of electric field (E) intensity of corresponding MIM SPP resonance mode along -axis as function of dipole distance. Inset, dependence of electric field dip intensity on dipole distances

Fig.5 Vertical profiles of magnetic field (H) intensity of corresponding MIM SPP resonance mode along -axis as function of dipole distance. Inset, dependence of magnetic field dip intensity on dipole distances

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