Simulation of light field regulation based on micro-nano structure and material properties
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摘要: 利用时域有限差分算法（FDTD）对微纳结构靶的光场分布进行仿真模拟，探究微纳结构靶中的光传输机制，分析材料特性和结构参数对光传输特性和光场分布的影响。基于光场分布及演化的仿真模拟结果，对比半导体氧化铝、绝缘体二氧化硅和金属铜三种导电性不同的材料上纳米线和纳米孔阵列微纳结构靶的激光传输特性，分析光传输过程中的光场分布变化。研究结果表明，通过改变氧化铝和二氧化硅纳米孔（线）阵列结构靶中孔洞（纳米线）直径和间距等结构参数，可以实现对微纳结构靶中光传输特性和光场分布的调制，实现光场在介质材料和真空区域间的周期振荡分布，或是以一种稳定形态传输；激光在铜纳米孔阵列中传输时，透光性随孔洞半径的增加而增加。基于光场分布及演化的仿真模拟结果，对比不同材料、不同微纳结构靶的激光传输演化特性，给出物理图像及对应现象规律，根据光场调控需求，给出微纳结构靶设计。Abstract: The finite-difference time-domain algorithm (FDTD) was used to simulate the optical field distribution of the micro-nano structure target, explore the optical transmission mechanism in the micro-nano structure target, and analyze the influence of material properties and structural parameters on the optical transmission characteristics and optical field distribution. Based on the simulation results of optical field distribution and evolution, the laser transmission characteristics in the nano-wire and nano-pore array targets of semiconductor alumina, insulator silicon dioxide and metal copper with different electrical conductivity are compared, and the modifications of optical field distribution during optical transmission are analyzed. The results show that the optical transmission characteristics and optical field distribution in the target can be modulated by changing the diameter and spacing of the holes (nanowires) in the target structure, and the optical field can be periodically oscillated between the dielectric material and the vacuum region, or transmitted in a stable state. When the laser is transmitted in the copper nanopore array, the light transmittance increases with the increase of the hole radius. Based on the simulation results of light field distribution and evolution, the laser transmission properties of different materials and micro-nano structure targets are compared, the physical images and corresponding phenomena are given, and the micro-nano structure target design is given according to the requirements of light field regulation.
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Key words:
- nanopore array target /
- nanowaire array target /
- Al2O3 /
- SiO2 /
- Cu /
- optical distribution
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图 2 孔洞阵列结构靶纵截面与横截面光场分布随纵轴位置变化示意图
Figure 2. Distribution of light field in longitudinal section and light field distribution in cross section of nanopore array target with position of vertical axis
图 3 结构靶横截面透射率随传输距离变化示意图
Figure 3. Schematic diagram of structural target cross section transmission variation with transmission distance
图 4 接收端与横截面光场分布图
Figure 4. Receiving end and cross-sectional light field distribution diagram
图 5 二氧化硅孔洞阵列结构靶纵截面光场分布以及横截面光场分布随纵轴位置变化示意图
Figure 5. Distribution of light field in longitudinal section of target with SiO2 cavity array structure and the light field distribution in cross section of target with SiO2 nanopore array target with position of vertical axis
图 6 接收端与横截面光场分布图
Figure 6. Receiving end and cross-sectional light field distribution diagram
图 7 铜孔洞阵列结构靶纵截面光场分布图
Figure 7. Light field distribution of the longitudinal section of the target with copper nanopore array structure
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