宽频十字缝隙分形纳米天线及其异常透射特性

刘觉夫,陈娇,李康康,等. 宽频十字缝隙分形纳米天线及其异常透射特性[J]. 光电工程,2020,47(6):190422. doi: 10.12086/oee.2020.190422
引用本文: 刘觉夫,陈娇,李康康,等. 宽频十字缝隙分形纳米天线及其异常透射特性[J]. 光电工程,2020,47(6):190422. doi: 10.12086/oee.2020.190422
Liu J F, Chen J, Li K K, et al. Broadband cross-slots fractal nano-antenna and its extraordinary optical transmission characteristics[J]. Opto-Electron Eng, 2020, 47(6): 190422. doi: 10.12086/oee.2020.190422
Citation: Liu J F, Chen J, Li K K, et al. Broadband cross-slots fractal nano-antenna and its extraordinary optical transmission characteristics[J]. Opto-Electron Eng, 2020, 47(6): 190422. doi: 10.12086/oee.2020.190422

宽频十字缝隙分形纳米天线及其异常透射特性

  • 基金项目:
    江西省杰出青年人才资助计划(20171BCB23062);江西省自然科学基金资助项目(20171BAB204022);江西省教育厅科学技术研究重点项目(GJJ170360)
详细信息
    作者简介:

    刘觉夫(1963-),男,硕士,教授,主要从事纳米天线异常透射及其能量收集的研究。E-mail:juefuliu@163.c

    通讯作者: 朱路(1976-),男,博士,教授,主要从事纳米天线能量收集、无线传感器网络的研究。E-mail:luyuanwanwan@163.com
  • 中图分类号: O431.1

Broadband cross-slots fractal nano-antenna and its extraordinary optical transmission characteristics

  • Fund Project: Supported by Jiangxi Outstanding Youth Talent Funding Scheme (20171BCB23062), Jiangxi Natural Science Foundation (20171BAB204022), and Jiangxi Provincial Department of Education Science and Technology Research Key Project (GJJ170360)
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  • 针对传统纳米天线结构存在频段窄、透射率低的问题,设计了十字缝隙分形纳米天线结构。采用时域有限差分法计算了十字缝隙分形纳米天线结构的异常透射特性,分析了均匀十字缝隙结构与其之间的透射特性差异,并讨论了物理参数对十字缝隙分形纳米天线异常透射特性的影响及分形尺寸与非分形尺寸下的纳米天线透射谱变化关系。结果表明,较于均匀十字缝隙结构,十字缝隙分形结构实现了光的异常透射及全2π透射光束相位调控,尺寸更小型化,半波宽(FWHM)更宽,透射率更高,最高可达99.51%;通过调整物理参数,透射谱呈现出红移或蓝移的特性,实现了透射谱的可控性;同时,当h=50 nm时,FWHM约为356 nm,透射率仍高达95.66%,普遍高于传统结构;并且在大入射角度(70°)下,峰值透射率仍旧大于74%。总之,较于其他纳米天线结构,十字缝隙分形纳米天线具有宽频、可控可调、结构更微型化等特点,且实现了光的异常透射。

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  • 图 1  十字缝隙分形纳米天线结构模型。(a)十字缝隙分形纳米天线结构;(b) 0分形;(c) 1分形;(d) 2分形

    Figure 1.  Cross-slots fractal nano-antenna structure model.(a) Cross-slot fractal nano-antenna structure; (b) 0-fractal; (c) 1-fractal; (d) 2-fractal

    图 2  十字缝隙分形纳米天线透射谱

    Figure 2.  Transmission spectrum of cross-slots fractal nano-antenna structure

    图 3  透射光束的场相位分布。(a) dx尺寸下;(b) dy尺寸下

    Figure 3.  The field phase distribution of the transmitted beam. (a) Under dx size; (b) Under dy size

    图 4  十字缝隙分形纳米天线表面的电场分布|E|。(a) 0分形:848.495 nm; (b) 1分形:854.598 nm; (c) 2分形:851.536 nm; (d) 1分形:449.995 nm;(e) 1分形:484.89 nm;(f) 1分形:537.542 nm;(g) 2分形:451.706 nm;(h) 2分形:478.061 nm;(i) 2分形:555.123 nm

    Figure 4.  The electric field distribution |E| on the surface of the cross-slots fractal nano-antenna. (a) 0-fractal: 848.495 nm; (b) 1-fractal: 854.598 nm; (c) 2-fractal: 851.536 nm; (d) 1-fractal: 449.995 nm; (e) 1-fractal: 484.89 nm; (f) 1-fractal: 537.542 nm; (g) 2-fractal: 451.706 nm; (h) 2-fractal: 478.061 nm; (i) 2-fractal: 555.123 nm

    图 5  均匀十字缝隙天线结构与十字缝隙分形结构的透射谱比较。(a) 0分形 & 0均匀;(b) 0均匀;(c) 1分形 & 1均匀;(d) 2分形 & 2均匀

    Figure 5.  Comparison of transmission spectra between uniform cross slots antenna structure and cross-slots fractal.(a) 0-fractal & 0-uniform; (b) 0-uniform; (c) 1-fractal & 1-uniform; (d) 2-fractal & 2-uniform

    图 6  不同结构参数下的纳米天线结构透射谱及其半波宽。(a)不同边长P下的透射谱;(b)不同厚度h下的透射谱;(c)不同边长P下的半波宽;(d)不同厚度h下的半波宽

    Figure 6.  Transmission spectrum and FWHM of nano-antenna structure under different structural parameters.(a) Transmission spectrum with different lengths P; (b) Transmission spectrum with different thickness h; (c) FWHM with different lengths P; (d) FWHM with different thickness h

    图 7  不同材料及入射角下的透射谱。(a)不同材料;(b)不同入射角

    Figure 7.  Transmission spectra of different materials and incident angles. (a) With different materials; (b) With different angles

    图 8  十字缝隙参数下的透射谱。(a)不同L1尺寸;(b)不同W1尺寸; (c)不同L2尺寸;(d)不同W2尺寸;(e)不同L3尺寸;(f)不同W3尺寸

    Figure 8.  Transmission spectrum under the cross slots parameter. (a) With different L1; (b) With different W1; (c) With different L2; (d) With different W2; (e) With different L3; (f) With different W3

    表 1  分形纳米天线实验数据

    Table 1.  The experimental data of fractal nano-antenna

    Fractal nano-structure Peak wavelength/nm Highest peak Slots area/nm2 Total area/nm2 The area ratio
    0-fractal 848.495 0.9701 37179 0.3035
    1-fractal 854.598 0.9937 53703 122500 0.4384
    2-fractal 851.536 0.9951 61047 0.4983
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出版历程
收稿日期:  2019-07-20
修回日期:  2019-12-25
刊出日期:  2020-06-01

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