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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 the light waves between two symmetrical circular regions in a two-dimensional Zn O random scattering particle are investigated. The time-domain finite difference method (FDTD) is used to simulate the light field distribution and mode spectrum when the distance D between two symmetrical circular regions in a two-dimensional random scattering system changes. Analysis of the intensity of the outgoing laser and the relationship between the central wavelength and D yields the best case for D = 0.8 μm. In this case, the outgoing laser center wavelength is 380.57 nm and the intensity is 4.81 × 104. By observing the distribution of the light field of the scattering system during the simulation under ideal conditions, the electric field intensity between the two circular areas is amplified by the coupling, and as the distance D between the circular areas increases, The intensity is increased, the spectral line width is reduced, and the number of modes is reduced.