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光子晶体引入缺陷后形成的缺陷模在增益介质中将被放大形成激光,为了进一步明确缺陷的激光特性,首先从理论上分析了光子晶体的特征矩阵,接着得出了以下光子禁带特性:光带隙宽度随着周期数的增加而增大,但在周期数达到一定数值后其光带隙宽度是确定不变的;折射率比值越大,光带隙宽度越大;叠加不同中心波长的光子晶体可以简单、有效地拓展光带隙范围。在一维KTP光子晶体的禁带特性实验分析中得到了KTP缺陷的光子能带结构的波长响应曲线;随着温度的上升,KTP的折射率随之增大,进而缺陷模向长波长方向移动。上述研究对于微小光源的发展具有一定的理论和实际意义。
The defect mode formed after the photonic crystal is introduced into the defect will be enlarged to form a laser in the gain medium. To further clarify the laser characteristics of the defect, the photonic crystal’s characteristic matrix is first analyzed theoretically and the following photon band gap characteristics are obtained: The bandgap width increases with the increase of the number of cycles, but the bandgap of the optical band gap is constant after the number of cycles reaches a certain value. The larger the refractive index ratio, the larger the optical bandgap width. Photonic crystals can simply and effectively extend the band gap range. The wavelength response curve of KTP-defect photonic band structure was obtained experimentally in the forbidden band characteristics of one-dimensional KTP photonic crystal. With the increase of temperature, the refractive index of KTP increased, and then the defect mode moved in the long wavelength direction . The above research has a certain theoretical and practical significance for the development of tiny light sources.