摘要
根据红外成像制导系统的轻量化、小型化、低成本发展需求,针对制导系统中的光学镜头进行轻量化设计。通过分析超透镜的波前调控原理和加工工艺,利用传输相位调控原理设计了基于硅和氟化钡材料的中红外波长超透镜,工作波长3μm,镜头厚度小于1mm,口径50mm时质量小于10g,热膨胀系数较低,环境适应性好。利用时域有限差分(FDTD)法对超透镜进行了仿真,通过设置对称边界条件缩短了仿真时间。仿真结果表明,当超透镜数值孔径为0.45时,聚焦效率为85%,焦斑半高宽为3.4μm。
According to the development requirements of lightweight, miniaturization, and low cost of infrared imaging guidance system, the lightweight design of the optical lens in the guidance system is carried out. By analyzing the principle and processing technology of the metalens lens wavefront control, a mid-infrared wavelength metalens based on silicon and barium fluoride materials is designed by using the transmission phase control principle. The working wavelength is 3μm, the lens thickness is less than 1 mm, the weight is less than 50 mm, the weight is less than 10 g, the thermal expansion coefficient is low, and the environmental adaptability is good. The finite difference time-domain(FDTD) method is used to simulate the metalens, and the simulation time is shortened by setting symmetric boundary conditions. The simulation results show that when the numerical aperture of the metalens is 0.45, the focusing efficiency is 85% and the focal spot size is 3.4 μm.
作者
仇宫润
王琨
赵峰
QIU Gongrun;WANG Kun;ZHAO Feng(61618 Troops,Beijing 100094;School of Space Information,Space Engineering University,Beijing 101416)
出处
《飞控与探测》
2021年第6期33-37,共5页
Flight Control & Detection
基金
国防科技创新特区专项(18-H863-01-ZT-002-055)。
