空心柱结构氧化锌纳米光源的理论研究

Theoretical Study on a Hollow-Hexagonal ZnO Nanocolumn as Nanoscopic Light Source

基于六角氧化锌纳米空心柱结构模型,求解了光波在三层圆柱结构模型中传输下的Helmholtz方程和Maxwell方程,得出了该结构的电场和磁场本征值。模拟结果得到了该结构模型下良好的发光特性。改变结构参数,对比总结并分析了不同尺寸下发光特性的变化;通过改变激发光波长和纳米结构的尺寸,总结了该结构中心处相对发光强度和模场直径等参数变化趋势;同时在长波段可见光激发下,氧化锌纳米空心柱结构具有更加显著的中心发光效应;结果还表明通过调整介质层厚度和空心柱折射率分布,可以改变该结构介质层中所能容纳的模式数,从而增加中心区域发光强度。综合所得结果,该结构的良好发光特性能应用于新型纳米光源领域。

Based on the structure model of the hollow-hexagonal ZnO nanocolumn, the eigenvalues of electric field and magnetic field were obtained by solving Helmholtz and Maxwell equations of the light wave through 3-layer-structured cylindrical waveguide. An ideal luminous effect of such nanostructure was obtained through stimulation. The variation of the luminescent property for different scales was compared, summarized and analyzed by changing structural parame- ters. The variation trends of the relative luminous intensity in the center of the structure and mode field diameter were summarized by changing emission wavelength and nanostructure size. At the same time, ZnO nanocolumns show the more remarkable central luminous effect under the excitation of the visible light with longer wavelength. The results also show that the number of modes in the dielectric layer of the structure can be changed by adjusting the thickness of the di- electric layer and the refractive index distribution of the hollow column, thereby the luminescent intensity of the center region increases. Based on the results, the good luminescence property of the structure can be applied to a new type of nanoscopic light source field.