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一种小型化高效率的介质光纳米天线

A Miniaturized and Highly Efficient Dielectric Optical Nanoantenna

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摘要

为了实现光相控阵的大规模扩展和无栅瓣扫描,提出了一种工作波长为1550 nm的小型化高效率的介质光纳米天线。设计的天线呈喇叭形,由硅材料构成,尺寸为亚波长量级。光通过硅波导从天线底部馈入,之后再被天线有效地辐射到自由空间中。由于硅材料对波长为1550 nm的光是透明的,因此材料吸收所造成的损耗非常小,天线具有很高的辐射效率。利用三维电磁场仿真软件对天线进行仿真、优化,最终得到在垂直于辐射方向的平面上投影尺寸为0.82 μm×0.28 μm的天线。仿真、优化的结果表明,天线在1550 nm处的增益为6.1 dB,辐射效率为82.7%,具有方向图对称性好、主瓣垂直辐射、无双向辐射等良好的辐射特性。

Abstract

To realize a large scalable optical phased array and beam steering without grating lobes, we design a miniaturized dielectric optical nanoantenna operating at 1550 nm with high efficiency. The nanoantenna is trumpet-shaped with a footprint and composed of silicon in the subwavelength order. Light is fed from the bottom of the nanoantenna by a silicon waveguide and then radiated into free space efficiently. Because silicon is nearly transparent to the wavelength of 1500 nm, absorption loss caused by the material is very low and the nanoantenna has a high radiation efficiency. A three-dimensional electromagnetic simulation software is used for simulation and optimization. The final footprint of the designed nanoantenna vertical to the radiation direction is 0.82 μm×0.28 μm. The results of simulation and optimization indicate that the nanoantenna has good radiation characteristics at 1550 nm with a gain of 6.1 dB, an efficiency of 82.7%, a good symmetry of radiation pattern, emitting vertically to the nanoantenna plane and no bidirectional radiation.

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中图分类号:TN214

DOI:10.3788/lop55.080601

所属栏目:光纤光学与光通信

基金项目:中国航天科技集团公司科技创新研发项目(KJJGTX-17)

收稿日期:2018-03-01

修改稿日期:2018-03-04

网络出版日期:2018-03-16

作者单位    点击查看

徐月:天地一体化信息技术国家重点实验室, 北京 100095北京卫星信息工程研究所, 北京 100095
董涛:天地一体化信息技术国家重点实验室, 北京 100095北京卫星信息工程研究所, 北京 100095
贺敬文:天地一体化信息技术国家重点实验室, 北京 100095北京卫星信息工程研究所, 北京 100095
万骞:天地一体化信息技术国家重点实验室, 北京 100095北京卫星信息工程研究所, 北京 100095

联系人作者:董涛(dongt@sgiit.cn); 徐月(xubancun509@163.com);

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引用该论文

Xu Yue,Dong Tao,He Jingwen,Wan Qian. A Miniaturized and Highly Efficient Dielectric Optical Nanoantenna[J]. Laser & Optoelectronics Progress, 2018, 55(8): 080601

徐月,董涛,贺敬文,万骞. 一种小型化高效率的介质光纳米天线[J]. 激光与光电子学进展, 2018, 55(8): 080601

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