基于MIM波导结构的等离子滤波器的研究
发布时间：2019-06-10 12:08
【摘要】：表面等离激元(Surface Plasmons Polaritons,SPPs)是一种金属与介质交界面上电子在外加高频电磁场作用下发生的集体震荡,并沿界面以疏密波的形式传输的行为。SPPs能够被束缚在金属表面,可以突破传统的衍射极限,具有局域场增强等独特的性质,因此SPPs被认为是用来实现微型通信元件、高密度集成光学回路最有可能的途径。能够传输SPPs的金属-电介质-金属(MIM)波导由于其结构简单,对SPPs的束缚性很强,传输距离远等特点吸引了研究者们的注意。本文首先采用有限元法研究了单支节型等离子波导滤波器的透射特征,研究结果表明支节长度越长、宽度越窄,透射极小值对应的波长越长;随后在单支节结构的异侧添加一个支节,构成双支节结构,通过研究发现支节间距不改变透射极小值的位置,只改变透射率的大小。并通过模场分布有效阐释了透射谱线中峰值、谷值的产生的物理机理。最后,在此基础上提出了一种含双侧多支节型等离子波导滤波器。在该结构的透射谱中观察到了基于电磁诱导透明(EIT)效应的四个窄带透射峰,数值研究同时表明当每个支节长度线性增加时,透射峰中心波长也将线性增加。这一结果可用于指导可调谐、多通道窄带滤波器的设计。
[Abstract]:Surface isolator (Surface Plasmons Polaritons,SPPs) is a kind of collective shock of electrons at the interface between metal and medium under the action of applied high frequency electromagnetic field, and transmits along the interface in the form of dense wave. SPPs can be bound to the metal surface. It can break through the traditional diffraction limit and has the unique properties such as local field enhancement, so SPPs is considered to be the most possible way to realize micro communication elements and high density integrated optical circuits. Metal-dielectric-metal (MIM) waveguides which can transmit SPPs have attracted the attention of researchers because of their simple structure, strong binding to SPPs and long transmission distance. In this paper, the transmission characteristics of single-branch plasma waveguide filter are studied by finite element method. The results show that the longer the branch length, the narrower the width, the longer the wavelength corresponding to the transmission minimum. Then a branch is added to the opposite side of the single branch structure to form the double branch structure. It is found that the distance between the branches does not change the position of the transmission minimum, but only changes the transmittance. The physical mechanism of peak and valley values in transmission lines is effectively explained by mode field distribution. Finally, a plasma waveguide filter with bilateral multi-nodes is proposed. Four narrowband transmission peaks based on electromagnetically induced transparent (EIT) effect are observed in the transmission spectrum of the structure. The numerical results also show that when the length of each branch increases linearly, the central wavelength of the transmission peak will also increase linearly. This result can be used to guide the design of tunable, multi-channel narrow-band filter.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN713
[Abstract]:Surface isolator (Surface Plasmons Polaritons,SPPs) is a kind of collective shock of electrons at the interface between metal and medium under the action of applied high frequency electromagnetic field, and transmits along the interface in the form of dense wave. SPPs can be bound to the metal surface. It can break through the traditional diffraction limit and has the unique properties such as local field enhancement, so SPPs is considered to be the most possible way to realize micro communication elements and high density integrated optical circuits. Metal-dielectric-metal (MIM) waveguides which can transmit SPPs have attracted the attention of researchers because of their simple structure, strong binding to SPPs and long transmission distance. In this paper, the transmission characteristics of single-branch plasma waveguide filter are studied by finite element method. The results show that the longer the branch length, the narrower the width, the longer the wavelength corresponding to the transmission minimum. Then a branch is added to the opposite side of the single branch structure to form the double branch structure. It is found that the distance between the branches does not change the position of the transmission minimum, but only changes the transmittance. The physical mechanism of peak and valley values in transmission lines is effectively explained by mode field distribution. Finally, a plasma waveguide filter with bilateral multi-nodes is proposed. Four narrowband transmission peaks based on electromagnetically induced transparent (EIT) effect are observed in the transmission spectrum of the structure. The numerical results also show that when the length of each branch increases linearly, the central wavelength of the transmission peak will also increase linearly. This result can be used to guide the design of tunable, multi-channel narrow-band filter.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN713
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