The PCF (photonic crystal fiber)is changed in electrical,temperature and chemical properties by filling with pores,liquids,particles,etc.Defects are realized by increasing the filling of the silver particles and the absence of circular air holes,and a novel PCF with approximate circular field is designed.The structural electric-field simulation analysis shows that the designed structure is characterized by electric-field localization, the electric-field peak appears,and the strong resolution and sensitivity are demonstrated in the terahertz band.The experimental analysis indicates that with the increase of pump density,a small degree of the spectral contraction can be observed,and the Q value of the structure reaches 0.3 MW/cm,which has raised one order of magnitude higher than that of the common system.The structural improvement realizes the enhancement of photon lifetime and can improve the waveguide transmission capability.Finally,the adjusted different structural parameters can be obtained through the dispersion analysis,which can easily achieve the design of PCF with different properties of positive flat dispersion,near zero flat dispersion,negative flat dispersion,etc.%通过增加银颗粒填充、圆形空气孔缺失实现缺陷,设计了模场近似圆形的新型PCF.结构的电场模拟分析得出:设计的结构具有电场局域化特点,出现电场峰值,在太赫兹波段表现较强的分辨率和灵敏度.实验分析得出:随着泵浦密度的增加能观察到很小程度的频谱收缩,结构的Q值达到了0.3 MW/cm,比常见系统提高了一个数量级,结构的改进实现了光子寿命增强,可以提高波导传输能力.色散分析得出,调整不同的结构参数,可以很方便地设计出具有正平坦色散、近零平坦色散、负平坦色散等不同性质的PCF.
展开▼
