各向异性特异材料波导中表面等离子体的共振性质

张利伟; 赵玉环; 王勤; 方恺; 李卫彬; 乔文涛

doi:10.7498/aps.61.068401

摘要

使用时域有限差分法,研究了各向异性特异材料(AMM)作为包层的AMM/介质/AMM波导中表面等离子体的共振性质.色散关系表明,当特异材料为负磁导率的always-cutoff型时,AMM/介质/AMM波导支持TE极化的表面等离子体,表面等离子体的波长随着中间介质层的厚度和特异材料磁等离子体频率的减小而变短.在有限长度AMM/介质/AMM波导中,由于两端界面的反射,表面等离子体模在波导中形成Fabry-Perot共振,而实现亚波长的表面等离子体微腔.在共振频率,电场强度在微腔的中部达到最大值,而磁场分别在两端界面处达到最大,电磁能强局域在中间介质层中,这一性质将在可调的具有强局域特性的亚波长微腔及腔量子电动力学中具有潜在的应用.

关键词:

Abstract

The resonance properties of surface plasmon in the AMM/dielectric/AMM waveguide are theoretically studied by using the finite-difference time-domain technique, where the claddings are anisotropic metamaterial (AMM) . From the dispersion relation, it is found that the AMM/dielectric/AMM waveguide supports TE polarized surface plasmon if AMM is always-cutoff with negative permeability. The wavelength of the surface plasmon becomes shorter when both the thickness of the dielectric core and the magnetic plasma frequency of AMM decrease. For an AMM/dielectric/AMM waveguide with a finite length, a subwavelength plasmon microcavity can be formed by Fabry-Perot resonance caused by the reflection of the guided mode at the entrance and the exit surfaces. At the resonant frequency, the electric field is maximized in the center, the magnetic field is maximized at the dielectric core entrance and exit, and the electromagnetic energy is strongly concentrated around the dielectric core. Such electromagnetic properties will have potential applications in the tunable subwavelength microcavity with strongly localized field and in the cavity quantum electrodynamics.

Keywords:

作者及机构信息

1.
河南理工大学物理化学学院, 焦作 454000;

2.
同济大学波耳固体物理研究所, 上海 200092

通信作者: 张利伟, lwzhang@hpu.edu.cn

基金项目: 国家自然科学基金(批准号: 10904032)、中国博士后科学基金(批准号: 20100480629)、河南省教育厅自然科学基金(批准号: 2010B140005, 2010A140004)、河南理工大学青年骨干教师基金(批准号: 649144) 和河南理工大学博士基金(批准号: B2009-88) 资助的课题.

Authors and contacts

1.
School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, China;

2.
Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China

Corresponding author: Zhang Li-Wei, lwzhang@hpu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 10904032), the China Postdoctoral Science Foundation Funded Project (Grant No. 20100480629), the Natural Science Foundation of Henan Educational Committee, China (Grant Nos. 2010B140005, 2010A140004), the Program for Youthful Key Teachers (Grant No. 649144), and the Doctoral Foundation (Grant No. B2009-88) in Henan Polytechnic University.

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施引文献

[1]	Veselago V G 1968 Soviet Physics Usp. 10 509
[2]
[3]	Sun Y Z, Ran L X, Wang D X, Wang W G, Chen Q L 2010 Acta Phys Sin. 59 4602 (in Chinese) [孙永志, 冉立新, 王东兴, 王伟光, 陈秋林 2010 物理学报 59 4602]
[4]
[5]	Alu` A, Engheta N 2003 IEEE Trans. Antennas Propagat. 51 2558
[6]	Zhang L W, Wang Y Z, He L, Xu J P 2010 Acta Phys Sin 59 6106 (in Chinese) [张利伟, 王佑贞, 赫丽, 许静平2010 物理学报 59 6106]
[7]
[8]	Zhou L, Wen W J, Chan C T, Shen P 2005 Phys. Rev. Lett. 94 243905
[9]
[10]
[11]	Xiang Y J, Dai X Y, We S C 2007 J. Opt. Soc. Am. B 24 2033
[12]
[13]	Marques R, Medina F, Rafii-EI-Idrissi R 2002 Phys. Rev. B 65 144440
[14]	Smith D R, Schultz S 2003 Phys. Rev. Lett. 90 077405
[15]
[16]
[17]	Schurig D, Smith D R 2003 Appl. Phys. Lett. 82 2215
[18]	Fang A, Koschny T, Soukoulis C M 2009 Phys. Rev. B 79 245127
[19]
[20]	Liu H Y, Lv Q, Luo H L, Wen S C 2010 Acta Phys Sin. 59 256 (in Chinese) [刘虹遥, 吕强, 罗海陆, 文双春 2010 物理学报 59 256]
[21]
[22]
[23]	Feng Y J, Teng X H, Wnag Z B, Zhao J M, Jiang T 2009 J. Appl. Phys. 105 034912
[24]
[25]	Jiang T, Zhao J M, Feng Y J 2009 Opt. Express 17 170
[26]	Ruppin R 2001 J. Phys.: Condens. Matter 13 1811
[27]
[28]	Miyazaki H T, Kurokawa Y 2006 Phys. Rev. Lett. 96 097401
[29]
[30]
[31]	Kurokawa Y, Miyazaki H T 2007 Phys. Rev. B 75 035411
[32]	Park J, Kim K Y, Lee I M, Na H, Lee S Y, Lee B 2010 Opt. Express 18 598
[33]
[34]
[35]	Stegeman G I, Wallis R F, Maradudin A A 1983 Opt. Lett. 8 386
[36]	Li M, Wen Z C, Fu J X, Fang X, Dai Y M, Liu R J, Han X F, Qiu X G 2009 J. Phys. D: Appl. Phys. 42 115420
[37]
[38]	Helgert C, Menzel C, Rockstuhl C, Pshenay-Severin E, Kley E B, Chipouline A, Tunnermann A, Lederer F, Pertsch T 2009 Opt. Lett. 34 704
[39]
[40]
[41]	Feng Y J, Teng X H, Chen Y, Jiang T 2005 Phys. Rev. B 72 245107
[42]
[43]	Dionne J A, Lezec H J, Atwater H A 2006 Nano Lett. 6 1928
[44]
[45]	Gordon R 2006 Phys. Rev. B 73 153405
[46]
[47]	Zhang L W, Zhang Y W, Zhao Y H, Zhai J W, Li L X 2010 Opt. Express 18 25052

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