MDM光波导激发高阶SPP模的传输特性

J4 ›› 2014, Vol. 31 ›› Issue (2): 252-256.

• 纤维与波导光学 • 上一篇

MDM光波导激发高阶SPP模的传输特性

赵华君,袁代蓉

重庆文理学院机电工程学院，重庆永川 402160

收稿日期:2013-07-22 修回日期:2013-08-20 出版日期:2014-03-28 发布日期:2014-03-20
通讯作者: 赵华君(1974- )重庆人，教授，从事微纳光子学与衍射光学的研究。 E-mail:zhaohjcu@163.com
基金资助:
重庆市教育委员会资助项目(批准号:KJ121224)

Propagation characteristic of the metal -dielectric - metal surface plasmon polariton waveguide for high-order modes

ZHAO Hua-jun, YUAN Dai-rong

College of Mechanical and Electronic Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China

Received:2013-07-22 Revised:2013-08-20 Published:2014-03-28 Online:2014-03-20

摘要/Abstract

摘要： 研究了金属-介质-金属(MDM)型表面等离子体激元(SPP)光波导的电磁特性。理论计算结果表明，对于633nm的TM偏振入射光，当介质膜层厚度小于85nm时，波导中只能激发产生一阶SPP模(基模)，其余高阶模全部截止。随着介质膜厚度增加，高阶SPP模逐渐被激发产生。当介质膜层厚度较小时，SPP模的有效折射率的实部随阶数的增加而减小，而虚部则随阶数的增加而增加，SPP基模具有最大传输距离。然而，当MDM波导中的介质层厚度超过0.555μm时，由于三阶SPP模的电磁场主要集中在离金属层相对较远的介质层中，其有效折射率的虚部具有最小值，具有最大的传输距离，而非基模。当入射光波长为633nm介质层厚度为0.9μm时，Ag/SiO2/Ag光波导中三阶SPP模的传输距离达到约150μm。

关键词: 波导光学, 金属-介质-金属, 表面等离子体激元, 传输距离, 高阶模

Abstract: A numerical analysis of surface plasmon waveguides exhibiting both propagation and distribution of electromagnetic field in Ag/SiO2/Ag (MDM) waveguides is presented. Attention is given to characterizing the dispersion relations, wavelength-dependent propagation, and energy density decay in two-dimensional metal - dielectric - metal structures. The results show that the waveguide can excitation the first order SPP mode (fundamental mode) for the wavelength of 633nm, if the dielectric film thickness is less than 85nm. With the dielectric film thickness is increased, progressively high order SPP modes are excited. The real part of the effective refractive index decreases with increasing the order of the SPP modes, but that of the imaginary part shows an opposite trend. However, when the dielectric layer of the MDM waveguide thickness is more than 0.555μm, since the third-order mode of the electromagnetic field SPP concentrated in relatively distant from the metal layer, the effective refractive index has a minimum value of the imaginary part. So the shird order SPP mode has a maximum propagation distance . When the wavelength of the incident light is 633nm, the dielectric layer thickness is 0.9μm Ag/SiO2/Ag, the transmission distance of the third-order SPP mode is about 150μm in the waveguide.

Key words: waveguide optics, Metal –dielectric - metal, Surface plasmon polariton, Propagation distances, High-order modes

中图分类号:

O431

赵华君袁代蓉. MDM光波导激发高阶SPP模的传输特性[J]. J4, 2014, 31(2): 252-256.

ZHAO Hua-jun, YUAN Dai-rong. Propagation characteristic of the metal -dielectric - metal surface plasmon polariton waveguide for high-order modes[J]. J4, 2014, 31(2): 252-256.

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MDM光波导激发高阶SPP模的传输特性

Propagation characteristic of the metal -dielectric - metal surface plasmon polariton waveguide for high-order modes

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