Study on the cut-off frequency of 1-D plasma photonic crystals
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摘要: 为了研究1维等离子体光子晶体的截止频率随介质材料的介电常数、等离子体频率、等离子体与介质材料厚度的比例系数以及入射角度的变化关系,采用传输矩阵方法,分析了1维等离子体光子晶体的色散关系,给出了截止频率的变化规律。结果表明,等离子体光子晶体不能完全截止任何小于等离子体频率的电磁波;随着入射角度的增加,截止频率逐渐趋向于等离子体频率;通过调节以上各参量,可实现等离子体光子晶体的可调谐功能。这与单纯等离子体截止频率相比,具有其鲜明特点。Abstract: In order to study the effect of the radio of micro plasma layer width to dielectric width, dielectric constant of the dielectric material, the plasma frequency and the incident angle on the cut-off frequency, the dispersion relation of one-dimension plasma photonic crystals was analyzed by means of transfer matrix method and the change rule of the cut-off frequency was put forward. The results show that plasma photonic crystals can't completely cut off the electromagnetic wave, whose frequency is less than the plasma frequency. The cutoff frequency comes close to the frequency of plasma when the incident angle of electromagnetic wave increases. The function of modulation for plasma photonic crystals can be realized by adjusting the index mentioned above.
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Keywords:
- optical device /
- plasma photonic crystal /
- transfer matrix method /
- cut-off frequency
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