共轴环光子晶体的缺陷微腔特性

 采用数值计算方法，模拟了共轴环光子晶体缺陷微腔的谐振模式场分布，计算了此微腔的品质因数和功率损耗，并分析其几何参数对谐振特性的影响。以此缺陷微腔为基础构建周期性慢波系统，讨论了该系统的色散特性。结果表明，微腔中能够存在单一的谐振模式，微腔的纵向长度和介质环介电常数对谐振特性影响较大。所构建的慢波系统有较宽的慢波频域，且慢波比曲线较为平坦。增大电子注开孔半径和减小周期长度对于提高工作频率及增加带宽较为有效。

Characteristics of coaxial photonic crystal defect microcavity

The field-pattern of various defect modes in the coaxial photonic crystal microcavity has been simulated using the numerical calculation method. The quality factor (Q-factor) and power loss of the microcavity have been calculated and the effect of geometrical parameters on the resonance characters was analyzed. Based on the defect microcavity, a periodic slow-wave system was constructed and the dispersion relation of this system has been discussed. The results indicate that a single defect mode can be gained in the microcavity and the resonance characters are sensitively affected by the longitudinal length of the cavity and the dielectric constant of medium rings. The slow-wave system has presented a good dispersion property and a relatively smooth slow-wave ratio curve with a wide range o