宽视场高增益亚波长结构集光天线的优化设计

发布时间：2018-06-12 17:14

本文选题：光学器件 + 异常透射　；参考：《激光技术》2017年01期

【摘要】：为了优化设计自由空间的高增益广角集光天线,采用有限元数值计算方法分析不同结构参量对"牛眼"结构、喇叭型结构及碗型结构的透射增强特性的影响,得到了凹槽个数与3种结构的表面等离子体异常透射增强系数之间的关系,获得了碗型亚波长结构光学天线的透射增强优化结构参量。结果表明,在单个凹槽结构能够有效激发表面等离子基元时,喇叭型结构光学天线的透射增强系数得到有效提高;通过结构参量优化,当入射角在±5°内时,喇叭型结构的透射增益倍数为20倍~140倍,在±5°~±26°之间获得较为平坦的增益,平均透射增强系数为10,和现有的结构参量相比,性能提高1倍;碗型结构在入射光为±60°的范围内有着较好的透射增强特性,平滑区的平均透射增强系数为10。碗型结构比喇叭结构具有更加出色的广角传输特性。
[Abstract]:In order to optimize the high gain wide-angle collector antenna designed for free space, the finite element method is used to analyze the influence of different structural parameters on the transmission enhancement characteristics of the "bull eye" structure, the horn structure and the bowl structure, and the relationship between the number of grooves and the abnormal transmission enhancement coefficients of the surface of the 3 kinds of structures is obtained. The transmission enhancement parameters of the bowl type subwavelength structured optical antenna are optimized. The results show that the transmission enhancement coefficient of the horn structure optical antenna is improved effectively when the single groove structure can effectively stimulate the surface plasma element, and the transmission gain times of the horn structure is doubled when the angle of entry is within + 5 degrees. The number is 20 times ~140 times, and the average transmission enhancement coefficient is 10. The average transmission enhancement coefficient is 10. Compared with the existing structural parameters, the performance is increased by 1 times. The bowl structure has a better transmission enhancement characteristic in the range of + 60 degrees in the incident light. The average transmission enhancement coefficient of the smooth region is 10. bowl structure than the horn structure. There is a better wide-angle transmission feature.
【作者单位】：广西大学物理科学与工程技术学院;
【基金】：国家自然科学基金资助项目(61367004) 广西自然科学基金资助项目(2013GXNSFFA019001)
【分类号】：TN820;TN929.1

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