近红外光谱区光子晶体禁带与KTP缺陷研究

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。

Near-infrared spectral region photonic crystal band gaps and KTP defect

Photonic crystal defect formed by the introduction of the defect was amplified in the gain medium and formed laser. To further clarify the laser characteristics of the defect, the matrix of the photonic crystals was theoretically analyzed and the characteristics of the photonic band gaps was obtained: the width of the optical band gaps increased as the number of cycles does, and a certain value exceed a certain amount of cycles was reached; the higher the value which determined by the width of the optical band gaps constant, the higher refractive index ratio; superposing different centers of the photonic crystal wavelength can effectively expand the optical band gaps range. The experimental result from the band gaps analysis reveals one-dimensional photonic crystals in the KTP, which negatively affects the photonic band structure of the wavelength response curve; the refractive index of the KTP increases as temperature increases, and then the direction of the long wavelength defect mode changes. The results of this study contributes to the theoretical and practical development of small light sources.