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为了解决材料表面结构对光子传播影响难计算的问题,采用拟蒙特卡罗算法。首先对材料的非线性吸收光分析;接着对左手材料折射率的空间分布进行周期性调制,使其不具有周期性结构;最后建立了拟蒙特卡罗模型。实验仿真得出入射光强趋于无穷大时存在激发态的非线性吸收现象,左手材料在中心频率及奇数倍频率附近透射率等于零,出现禁带,而在基频的偶数倍处光子禁带消失,拟蒙特卡罗算法的计算误差较小、处理时间较少。
In order to solve the difficult problem of the influence of the material surface structure on the photon propagation, the quasi-Monte Carlo algorithm is adopted. Firstly, the material is analyzed by nonlinear absorption light; then the spatial distribution of the refractive index of the left-handed material is periodically modulated so as to have no periodic structure; finally, a quasi-Monte Carlo model is established. The experimental results show that there is nonlinear absorption of the excited state when the incident light intensity tends to infinity. The transmissivity of the left-handed material near the center frequency and the odd multiple is equal to zero, and the forbidden band appears, while the photon forbidden band disappears at an even multiple of the fundamental frequency , The calculated error of quasi-Monte Carlo algorithm is smaller, and the processing time is less.