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针对薄膜介质内的慢光现象,研究了它的产生机理及影响因素。由于薄膜介质的厚度很小,因此假设磁场沿厚度方向的分量与厚度无关,从而得到薄膜介质中光传播的色散关系,推导出光在薄膜中传播的群速度表达式。深入分析了光的频率、薄膜介质的折射率以及薄膜介质的厚度对群速度的影响,得到了这些影响因素对光在薄膜介质中群速度的影响曲线。研究表明选取适当的光频率、薄膜折射率和薄膜厚度可以大幅度地降低光在薄膜介质中的传播速度,为薄膜介质中的慢光技术提供了理论依据。
Aiming at the slow light phenomenon in thin film medium, the mechanism of its occurrence and the influencing factors were studied. Since the thickness of the thin film medium is small, it is assumed that the component of the magnetic field in the thickness direction has no relation with the thickness, so that the dispersion relation of light propagation in the thin film medium is obtained and the group velocity expression of light propagating in the thin film is deduced. The effect of light frequency, refractive index of thin film medium and thickness of thin film medium on group velocity is deeply analyzed. The influence of these factors on the group velocity in light medium is obtained. The research shows that choosing the appropriate optical frequency, film refractive index and film thickness can greatly reduce the light propagation speed in the film medium, providing a theoretical basis for the slow light technology in the film medium.