论文部分内容阅读
通过平面波展开法(PWE)计算硫系光子晶体带隙并采用时域有限差分法(FDTD)模拟硫系60°弯曲光子晶体波导的传输特性,在波导弯曲部分线缺陷处添加小空气孔缺陷,提高了其带宽和透光性。在60°弯曲区域线缺陷外边缘处引入2个对称空气孔,通过改变其半径来改善波导传输效率。模拟结果表明,当引入半径为0.54R的空气孔时,传输带宽由初始的60 nm提高到161 nm,但此时透射率波动性较大。在此基础上在弯曲线缺陷中心处又引入若干个空气孔,当引入3个半径为0.48R的空气孔时,此种结构不但提高了波导的传输效率,并且使传输带宽增加到340 nm。将单个60°弯曲波导优化结构应用于连续60°弯曲波导中,研究结果表明连续弯曲波导的传输效率得到显著提高。
The band gap of the sulfur-based photonic crystal was calculated by the plane wave expansion method (PWE) and the transmission characteristics of the sulfur-based 60 ° bent photonic crystal waveguide were modeled by the finite-difference time-domain method (FDTD). Small air hole defects were added at the bending defects of the waveguide. Improve its bandwidth and light transmission. Two symmetrical air holes are introduced at the outer edge of the line defect at the bending region of 60 °, and the waveguide transmission efficiency is improved by changing the radius. The simulation results show that when the air hole with a radius of 0.54R is introduced, the transmission bandwidth increases from the initial 60 nm to 161 nm, but the transmittance is more volatile at this time. On this basis, several air holes are introduced into the center of the bending line defect. When three air holes with a radius of 0.48R are introduced, this structure not only improves the transmission efficiency of the waveguide but also increases the transmission bandwidth to 340 nm. A single 60 ° bent waveguide optimized structure is applied to a continuous 60 ° bent waveguide. The results show that the transmission efficiency of the continuous curved waveguide is significantly improved.