光束在左手材料中的强度和相位旋转特性
Intensity and phase rotation of beams in left-handed metamaterials
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摘要: 建立了左手材料中拉盖尔高斯光束传输模型,通过研究拉盖尔高斯光束的相位分布来分析光束的强度旋转特性。具体分析了光束参数模式、Gouy相、频率和色散对光束强度和相位旋转特性的影响。研究发现:方位角相差是导致光束强度旋转的主要原因;负折射率引起的逆的Gouy相移将会导致光束强度反转;在正常色散区左手材料中光束的强度和相位旋转方向是相同的，而在反常色散区，左手材料中光束的强度和相位旋转方向是相反的。Abstract: The propagation model of Laguerre-Gaussian beams in left-handed materials was established. Through the study of phase distribution, the rotation was found to be dependent on model parameters, Gouy phase, frequency, and dispersion. The azimuthal phase difference is the main reason for the intensity rotation. The inverse Gouy phase shift caused by the negative refractive index leads to a reverse rotation of intensity. In the normal dispersion regime, the phase and the intensity rotate in the same direction. In the anomalous dispersion regime, however, they rotate in opposite directions.
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Key words:
- left-handed materials /
- laguerre-gaussian beam /
- intensity rotation /
- gouy phase shift
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