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金属亚波长狭缝中凹槽对其透过特性的影响
Influence of groove in metallic subwavelength slit on transmission properties
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摘要: 利用时域有限差分方法,研究了单个二维金属亚波长狭缝中空气凹槽的结构、位置等参数变化对其透过特性的影响.整个缝槽结构可以类比为LC振荡环路,凹槽结构变化时,不同程度地改变振荡电路的电感和电容,从而使共振透射峰出现移动.凹槽位置变化时,电路的驱动源改变,从而改变缝槽结构中的电磁场分布,使得共振透射峰出现分裂.利用LC共振原理分析了凹槽各个参数变化时共振透射峰的变化情况.Abstract: The influence of the structure and position of groove in a two-dimensional metallic subwavelength slit on transmission properties has been studied with the finite-difference time-domain method. The whole structure of slit with perpendicular groove could be regard as a LC oscillation circuit. The capacitance and inductance of this oscillation circuit will be altered when the structure of groove varies,so that the resonant transmission peaks shift. And the drive source of circuit changes when the position of groove moves along the slit, as a result the distribution of electromagnetic filed in the structure is changed also. So the resonant transmission peaks are split. In this paper, the change of resonant transmission peaks as each parameter of the groove changes is analyzed with the principle of LC resonance.
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