摘要
从理论上分析设计了三角晶格的光子晶体,利用时域有限差分法模拟横电模(TE模)在二维光子晶体中的传播,并对模拟得到的电磁场数据作傅里叶变换得到其频谱。通过对各个频谱成分的相位作分析,计算出光子晶体的等效折射率。进一步发现不同的空间频率对应的相速度方向是不同的,正折射的频率对应的相速度方向与能量传播方向一致,负折射的频率对应的相速度方向与能量传播方向相反。对光子晶体内部电场的变化做了详细的分析,以期为探究光子晶体与电磁波作用的物理机理提供扎实的理论依据。
A triangular photonic crystal is designed theoretically. An analysis on the transmission properties of the transverse electric mode （TE mode） in two dimensional （2D） photonic crystal with triangular lattice is presented based on the finite difference time domain technique. The frequency spectrum is extracted from the simulated electromagnetic field data by Fourier transform. By analyzing the phase of each spectral component, the equivalent refractive index of a photonic crystal is calculated, the results show the different relationship between the spatial frequency and phase velocity. For the frequency of positive refraction, the phase velocity and energy are in the same direction. On the contrary, For the frequency of positive refraction, the phase velocity and energy are in the opposite direction. The result might provide a solid theoretical basis in the inquisition of photonic crystal physical mechanism.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第6期188-195,共8页
Laser & Optoelectronics Progress
基金
国家973计划(2011CB707504)
国家自然科学基金(61177043
11104184)
国家青年科学基金(61308096)
关键词
材料
光子晶体
时域有限差分法
等相位面
等效折射率
materials
photonic crystal
finite difference time domain
equi-lahase surface
effective refractive index
