硫系60°弯曲光子晶体波导结构优化及传输特性研究

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。

Abstract

The plane wave expansion method (PWE) is adopted to calculate chalcogenide photonic crystal bandgap, and finite difference time domain (FDTD) method is used to simulate transmission characteristics for 60° bent chalcogenide photonic crystal waveguide. Two symmetric air-holes are introduced in outer edge of line defects in the 60° bent region, in order to improve the transmission efficiency by adjusting the radii of the air-holes. The simulation result shows that transmission bandwidth is widened from the initial 60 nm to 161 nm while the radius of the air-holes is 0.54R, however, the transmission efficiency fluctuates violently. Then some more air-holes are introduced in the central line defect in bent region. It is noticed that when 3 air-holes with radius of 0.48R are added, not only the transmission efficiency is improvement, but also the transmission bandwidth is widened to 340 nm. Continuous bend of 60° waveguide structure optimization is similar to that of single one, and the result shows that the transmission efficiency in continuous bend of waveguide can be significantly improved.

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魏凤娟, 张巍, 韩金涛, 王贤旺, 吴越豪, 张培晴, 戴世勋, 聂秋华. 硫系60°弯曲光子晶体波导结构优化及传输特性研究[J]. 中国激光, 2015, 42(12): 1205001. Wei Fengjuan, Zhang Wei, Han Jintao, Wang Xianwang, Wu Yuehao, Zhang Peiqing, Dai Shixun, Nie Qiuhua. Transmission Characteristics and Structure Optimization of 60° Bent Chalcogenide Photonic Crystal Waveguides[J]. Chinese Journal of Lasers, 2015, 42(12): 1205001.

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