通过平面波展开法对二维点缺陷三角晶格光子晶体的微腔结构进行研究,计算得出其色散图以及缺陷模分布。结果表明：缺陷模波长与微腔谐振波长基本吻合。利用FDTD模拟谐振波长波段的电磁波在光子晶体中传播的动态演化过程,并计算出局域模的空间分布图。最后在有规律地改变缺陷周围介质柱半径的情况下实现谐振中心波长的可调性。

In this paper we study the micro-cavity structure of the two-dimensional triangular lattice photonic crystal with defects by using plane wave expansion method.We can calculate dispersion curves and the distribution of defect mode.Results show that the wave of the defect mode is consistent with the wavelength of the micro-cavity resonant wave.We simulat the dynamic propagating process in the photonic crystal about electromagnetic wave of the resonant wavelength band by using FDTD method,thus we can figure out the graph of the local mode′s space distribution.Finally,we carry out the tuneable property of the centralwavelength of the resonant wave by changing the radius of dielectric cylinder around the defect regularly.