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为了节省时域有限差分(FDTD)法的计算时间,提出了许多将FDTD的时域结果转换到频域的方法.文中介绍了一种基于Baker算法的Pad啨近似,并展示了其在光子晶体模拟中的应用.对频率为160THz,品质因子为5000的简单谐振子,结果显示Pad啨近似用28时间步数据得到的强度谱比快速傅里叶变换用220时间步数据得到的强度谱更精确.采用这一Pad啨近似,光子晶体平板结构中不同波矢对应的模式频率和品质因子及其能带结构可以在很短的FDTD输出结果下得出.另外,Pad啨近似也用于计算光子晶体微腔的腏狡德屎推分室蜃?
In order to save computational time of finite difference time-domain (FDTD) method, many methods of transforming FDTD time-domain result to frequency domain are proposed.In this paper, a Pad 啨 approximation based on Baker algorithm is introduced and its application in photonic crystal Simulation results show that for the simple harmonic oscillator with a frequency of 160 THz and a quality factor of 5000, the intensity spectrum obtained with Pad 啨 approximation with 28 time step data is more accurate than the intensity spectrum obtained with Fast Fourier Transform with 220 time step data Using this Pad 啨 approximation, the mode frequencies and quality factors associated with different wave vectors in the photonic crystal slab structure and their band structures can be found with very short FDTD output results. In addition, the Pad 啨 approximation is also used to calculate photons Crystal microcavity 腏 soda shit push room mirage?