缝隙八木纳米天线设计及宽波段吸收特性

朱路; 王杨; 刘媛媛; 黄志群; 慈白山

doi:doi:10.3788/gzxb20164510.1024002

光子学报, 2016, 45 (10): 1024002, 网络出版: 2016-11-14

缝隙八木纳米天线设计及宽波段吸收特性

Design of Slot Yagi-Uda Nanoantennas and Their Broadband Absorption Properties

论文大纲

朱路 ^*王杨刘媛媛黄志群慈白山

作者单位

华东交通大学信息工程学院，南昌 330013

摘要

针对传统光伏电池能量收集易受环境与光照时间限制的问题，本文设计了一种用于太阳能收集的缝隙八木纳米天线单元及阵列.采用时域有限差分法分析缝隙间距对纳米天线远场方向性和近场分布的影响,并研究缝隙八木纳米天线阵列的吸收特性及不同缝隙间距对阵列天线吸收率的影响.研究远场方向性发现,当缝隙间距增加到一定距离时，天线方向图出现多个副瓣并产生新的辐射模式；通过对近场分析表明，新辐射模式的产生来源于高阶模式的局域表面等离激元.天线阵列吸收率的仿真结果表明：在400～1 500 nm波段，随着缝隙间距的增加，缝隙八木纳米天线阵列吸收率呈上升趋势，当缝隙间距等于80 nm时，在400～660 nm、760～1 300 nm两个波段内吸收率较高，吸收峰值最大可以达到98%；以吸收率大于50%为基准，当缝隙间距等于80 nm时，其吸收波段最宽.

Abstract

Aim at the problem that the energy collection of traditional photovoltaic cells is susceptible to environment and illumination time constraints, a slot Yagi-Uda nanoantenna unit and array was proposed for solar energy harvest. By adopting the finite difference time domain method, the influence of gap spacing on the nano antenna far field directivity and the near field distribution was analyzed. The influence of the absorption characteristics of slot Yagi-Uda nanoantenna array and the different slot spacing on the array antenna absorption rate was studied. The study of far field directivity shows that, when the slot spacing increases to a certain distance, the antenna far-filed pattern appears multi-sidelobe and a new radiation pattern. The analysis of the near field thows that, the new radiation pattern is derived from the high order mode of localized surface plasmon. The simulation results of the antenna array absorption rate show that, in the waveband range from 400nm to 1500nm, with the increase of slot spacing, the absorption rate shows a trend of rising. When the slot spacing is equal to 80nm, the antenna absorption rate is higher in the band range from 400nm to 660nm and the range from760nm to 1300nm, the absorption peak value can reach 98%. The absorption rate exceeds 50% as a benchmark, when the slot spacing is equal to 80nm, the absorption band is widest.

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朱路, 王杨, 刘媛媛, 黄志群, 慈白山. 缝隙八木纳米天线设计及宽波段吸收特性[J]. 光子学报, 2016, 45(10): 1024002. ZHU Lu, WANG Yang, LIU Yuan-yuan, HUANG Zhi-qun, CI Bai-shan. Design of Slot Yagi-Uda Nanoantennas and Their Broadband Absorption Properties[J]. ACTA PHOTONICA SINICA, 2016, 45(10): 1024002.

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