ZnO随机激光器中对称圆形区域间的耦合特性分析  

Coupling Analysis Between Symmetrical Circular Areas in ZnO Random Laser

作　　者：李志全[1] 赵晶晶[1] 孟晓云[1] 朴瑞琦 李文超[2] 牛力勇[1] 顾而丹[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004 [2]东北大学秦皇岛分校控制工程学院,河北秦皇岛066004

出　　处：《光学学报》2015年第11期199-205,共7页Acta Optica Sinica

基　　金：河北省百人计划(4570018);河北省自然科学基金(F2014501150)

摘　　要：研究二维Zn O随机散射粒子中2个对称的圆形区域间光波的耦合特性。利用时域有限差分法(FDTD)数值模拟了二维随机散射系统中2个对称圆形区域间的距离D变化时的光场分布及模式频谱图,并对D不同时的情况进行对比分析。分析出射激光的强度和中心波长与D的关系,得到D=0.8μm时为最佳情况。此时,出射激光中心波长为380.57 nm,强度为4.81×104。通过观察理想情况下散射系统在仿真过程中的光场分布图表明,2个圆形区域之间的电场强度经过耦合得到放大,且随着圆形区域之间距离D的增大,出射激光的强度增强,光谱线宽度减小,模式数量减少。The coupling characteristics of light-wave between two symmetrical circular areas in the two- dimensional ZnO random scattering particles are studied. The distribution of the optical filed and the spectrogram of mode in two-dimensional random scattering particles system are numerically simulated and compared by using the finite difference time domain （FDTD） method, when the distance D between the two symmetrical circular areas changes. The dependence of the emission intensity and the center wavelength on D is analyzed and it is obtained that the wavelength with 380.57 nm and the intensity of laser with 4.81 × 10^4 are the optimal parameters while D = 0.8μm. In ideal conditions, the optical field distribution of scattering system is observed during the simulation process. The result shows that the electric field intensity between two circular areas is amplified after coupling. With the increasing of D which is the distance between the circular regions, the electric field intensity is enhanced, the spectral line width is decreased, and the number of modes is reduced.

关 键 词：激光光学 随机散射粒子 光波耦合 时域有限差分 模式频谱 

分 类 号：TN24[电子电信—物理电子学]