A Broadband Plasmonic Filter of Subwavelength Zigzag-shaped MIM Waveguides

LI Wei-jun; XIANG Dong

doi:10.3788/fgxb20133412.1657

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A Broadband Plasmonic Filter of Subwavelength Zigzag-shaped MIM Waveguides

更新时间：2020-08-12

- A Broadband Plasmonic Filter of Subwavelength Zigzag-shaped MIM Waveguides
- Chinese Journal of Luminescence Vol. 34, Issue 12, Pages: 1657-1661(2013)
- 作者机构：
  
  1. 南华大学核科学技术学院,湖南衡阳,421001
  2. 南华大学数理学院,湖南衡阳,421001
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20133412.1657
  CLC： O436;TN252
- Received：09 September 2013，
  
  Revised：26 September 2013，
  
  Published：10 December 2013
- 稿件说明：
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李伟军, 向东. 亚波长之字形MIM等离子波导宽带滤波器[J]. 发光学报, 2013,34(12): 1657-1661

LI Wei-jun, XIANG Dong. A Broadband Plasmonic Filter of Subwavelength Zigzag-shaped MIM Waveguides[J]. Chinese Journal of Luminescence, 2013,34(12): 1657-1661
李伟军, 向东. 亚波长之字形MIM等离子波导宽带滤波器[J]. 发光学报, 2013,34(12): 1657-1661 DOI： 10.3788/fgxb20133412.1657.

LI Wei-jun, XIANG Dong. A Broadband Plasmonic Filter of Subwavelength Zigzag-shaped MIM Waveguides[J]. Chinese Journal of Luminescence, 2013,34(12): 1657-1661 DOI： 10.3788/fgxb20133412.1657.

摘要

运用时域有限差分（FDTD）方法数值研究了一种亚波长之字形金属-绝缘体-金属（MIM）等离子波导结构的传输属性。之字形波导在连续两个拐角可向外延伸出1~4个短切口。每个切口独立构成一个谐振腔，谐振波长近似与切口深度成线性正比，而与切口方向无关。当任意一个切口满足谐振条件时，该波导结构在对应波长的透射率均趋近于0。随着同深度切口数目的增加，禁带波长区域逐渐展宽，形成一个良好的宽带滤波器。

Abstract

The transmission of a subwavelength zigzag-shaped metal-insulator-metal (MIM) plasmonic waveguide structure was numerically researched by using the finite-difference time-domain (FDTD) method. The zigzag-shaped waveguide has two bending corners

where waveguide can extend out from one to four cuts. Each cut can be looked as a self-existent resonant cavity. The resonant wavelength is approximately linear proportional to the depth of cut

and independent on the direction of cut. When any cut satisfies with the resonant condition

the transmission of the waveguide structure is close to zero at the resonant wavelength. With the increase of number of the same depth of cuts

the wavelength region of band gap is broaden gradually

thus a good broadband filter is formed.

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Keywords

references

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