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光子晶体在传感、滤波和光子晶体激光器等方面具有很重要的应用价值。设计了一种基于改变缺陷介质折射率的可调谐二维正方晶格和三角晶格光子晶体激光器微腔,在平面光子晶体薄板中引入点缺陷磷酸氧钛钾(KTP),在KTP两端施加交流电场控制KTP晶体折射率变化。实验中随着KTP晶体折射率逐渐增大,正方晶格光子晶体禁带数量减少,归一化频率减小,禁带宽度基本不变;而三角晶格光子晶体禁带逐渐变窄,且向低频方向移动。最后,用平面波展开法分析了晶体的能带结构,得到理论上的描述,验证了实验结果。
Photonic crystals have very important application value in sensing, filtering and photonic crystal lasers. A tunable two-dimensional square lattice and triangular lattice photonic crystal laser microcavity based on the refractive index of the defect medium is designed. Point defect potassium titanyl phosphate (KTP) is introduced into the planar photonic crystal sheet and applied at both ends of KTP AC Electric Field Controlling the Change of KTP Crystal Refractive Index. In the experiment, as the refractive index of KTP crystal increases, the number of forbidden band in the tetragonal lattice photonic crystal decreases, the normalized frequency decreases and the forbidden band width remains unchanged, while the forbidden band in the triangular lattice photonic crystal becomes narrower, Low-frequency direction of movement. Finally, the energy band structure of the crystal was analyzed by the plane wave expansion method, and the theoretical description was given to verify the experimental results.