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提出了一种基于介质基片上的周期性空气槽和一条有缺陷的线形周期性空气孔复合型二维光子晶体微谐振腔。利用 FDTD 方法对所提出的结构进行了数字模拟,模拟结果证实了这种结构在光子禁带区域内存在谐振模式,是一种有效的微谐振腔。这种微谐振腔的谐振波长主要由空气孔的周期和缺陷区的长度决定,而周期数量的多少对谐振波长的影响较小。当空气槽参数固定时,谐振波长与空气孔的周期成正比。在一定的范围内,谐振波长随缺陷区的长度增加而近似线性增加。谐振腔的品质因子随输出端空气孔的数量增加而快速增长。在某一特定的缺陷长度时,谐振腔的品质因子达到极大值。这种谐振腔的波输出的方向固定在槽轴线的方向上。
A novel two-dimensional photonic crystal microcrystal resonator based on a periodic air groove on a dielectric substrate and a defective linear periodic air hole was proposed. The FDTD method is used to simulate the proposed structure. The simulation results show that this structure has a resonant mode in the photonic band gap region and is an effective microresonator. The resonant wavelength of this kind of microresonance cavity is mainly determined by the period of the air hole and the length of the defect area, while the number of cycles has less effect on the resonant wavelength. When the air tank parameters are fixed, the resonant wavelength is proportional to the cycle of the air hole. Within a certain range, the resonant wavelength increases approximately linearly with the length of the defect region. The cavity’s quality factor increases rapidly with the number of air holes at the output. At a given defect length, the cavity’s quality factor reaches its maximum. The direction of the wave output of such a resonator is fixed in the direction of the slot axis.