同轴纳米柱对亚波长金属牛眼结构EOT的调控

杨泽华, 宋阳, 陈爽, 等. 同轴纳米柱对亚波长金属牛眼结构EOT的调控[J]. 光电工程, 2018, 45(11): 180207. doi: 10.12086/oee.2018.180207
引用本文: 杨泽华, 宋阳, 陈爽, 等. 同轴纳米柱对亚波长金属牛眼结构EOT的调控[J]. 光电工程, 2018, 45(11): 180207. doi: 10.12086/oee.2018.180207
Yang Zehua, Song Yang, Chen Shuang, et al. Control of EOT of subwavelength metal bullseye structures by coaxial nano-columns[J]. Opto-Electronic Engineering, 2018, 45(11): 180207. doi: 10.12086/oee.2018.180207
Citation: Yang Zehua, Song Yang, Chen Shuang, et al. Control of EOT of subwavelength metal bullseye structures by coaxial nano-columns[J]. Opto-Electronic Engineering, 2018, 45(11): 180207. doi: 10.12086/oee.2018.180207

同轴纳米柱对亚波长金属牛眼结构EOT的调控

  • 基金项目:
    黑龙江省自然科学基金资助项目(F2018027)
详细信息
    作者简介:
    通讯作者: 高亚臣(1969-),男,博士,教授,主要从事非线性光学材料与纳米光子学的研究。E-mail:gaoyachen@hlju.edu.cn
  • 中图分类号: O734

Control of EOT of subwavelength metal bullseye structures by coaxial nano-columns

  • Fund Project: Supported by Natural Science Foundation of Heilongjiang Province (F2018027)
More Information
  • 牛眼结构是一种典型的纳米光学结构。本文设计了一种带有同轴纳米柱的牛眼结构,利用时域有限差分法(FDTD)研究了该结构的增强透射效应。研究发现,柱的半径和高度对透射特性具有显著的影响,恰当选择柱的半径和高度会得到最大的透射强度。另外,牛眼结构对环境折射率有较高的灵敏度。理论分析表明,该种结构的透射增强效应是由局域表面等离激元与表面极化等离激元相互作用产生。这为纳米光学元件的研发与应用提供一个新的思路。

  • Overview: In 1998, the Ebbesen team reported the phenomenon of extraordinary optical transmission in arrays of subwavelength hole on metal substrate. Since then, people have conducted extensive research on the mechanism of EOT and proposed several theoretical models. Ebbesen, Ghaemi et al. proposed surface plasmon excitation and Wood extraordinary effects. In 2004, Koerkamp et al. studied the influence of the aspect ratio of the rectangular aperture on the transmission peak and the central wavelength. They believed that the coupling between local waveguide resonance and plasmon resonance led to EOT. Similar models also have compound diffraction evanescent wave mode proposed by Lezec and Thio et al. At present, people mainly use square holes, round holes, triangular holes, wedge-shaped slits, and groove arrays to study EOT. The bullseye structure is a kind of round-hole structure. It is a single-hole structure surrounded by periodic surface corrugation proposed by Thio in 2002. Due to its circular symmetry, it can make Huygens waves better matches the plasmon mode under random polarized light, so it has a higher transmission coefficient than the square-hole structure and the groove array structure.

    We designed a bullseye structure with coaxial nano-pillars and used the finite-difference time-domain method to simulate the transmission characteristics of proposed new structure. The specific simulation tool we used is FDTD Solution. We studied the influence of the radius and height of the nano-column on the transmission. The results show that changing the radius and height of the column can significantly change the peak and resonance wavelength of the main transmission peak. When the nano-column has a radius of 46 nm and a height of 20 nm, the bullseye structure obtains the maximum transmission intensity, whose the main transmission peak increases by about 90% compared to the bullseye structure without filling. In addition, the main transmission peak wavelength of the structure changes approximately linearly with the ambient refractive index, and the refractive index sensitivity can reach 653.4 nm/RIU. Theoretical analyses show that the physical mechanism of the effect of nano-columns on the transmission characteristics of bullseye structures is that under the excitation of incident light, the LSP polarized by the nano-columns couples with the SPP and LSP existing in the structure, resulting in a change in resonance position and intensity, further leading to frequency shifts and peak changes. By changing the geometry of the nano-pillars, the transmitted light intensity of the bullseye structure can be controlled. In addition, because the structure has a high sensitivity to environmental refractive index, it has potential applications in the field of refractive index sensors.

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  • 图 1  纳米柱牛眼结构的模型。(a) X-Z面截面图;(b) X-Y面截面图

    Figure 1.  Model of the bullseye structure with nano-column.(a) X-Z cross section; (b) X-Y cross section

    图 2  纳米柱半径不同的牛眼结构的透射率

    Figure 2.  Transmittance of the bullseye structures with different-radii nano-columns

    图 3  纳米柱半径不同时,牛眼结构在共振波长下的电场分布。(a) XOZ电场(λ=660 nm, r=0 nm);(b) XOY电场(λ=660 nm, r=0 nm);(c) XOZ电场(λ=653 nm, r=45 nm); (d) XOY电场(λ=653 nm, r=45 nm); (e) XOZ电场(λ=647 nm, r=100 nm); (f) XOY电场(λ=647 nm, r=100 nm)

    Figure 3.  Electric field distributions of the bullseye structures with different-radii nano-columns at the resonance wavelengths.(a) XOZ electric field(λ=660 nm, r=0 nm); (b) XOY electric field(λ=660 nm, r=0 nm); (c) XOZ electric field(λ=653 nm, r=45 nm); (d) XOY electric field(λ=653 nm, r=45 nm); (e) XOZ electric field(λ=647 nm, r=100 nm); (f) XOY electric field (λ=647 nm, r=100 nm)

    图 4  纳米柱的半径不同时,牛眼结构在共振波长下的电场分布。(a) XOZ电场(λ=654 nm, r=75 nm);(b) XOZ电场(λ=714 nm, r=75 nm);(c) XOZ电场(λ=654 nm, r=90 nm);(d) XOZ电场(λ=714 nm, r=90 nm)

    Figure 4.  Electric field distributions of the bullseye structures with different-radii nano-columns at the resonant wavelengths.(a) XOZ electric field(λ=654 nm, r=75 nm); (b) XOZ electric field(λ=714 nm, r=75 nm); (c) XOZ electric field(λ=654 nm, r=90 nm); (d) XOZ electric field(λ=714 nm, r=90 nm)

    图 5  r=75 nm时电场分布的两种模式。(a)模式1;(b)模式2

    Figure 5.  Two modes of electric field distribution of the bullseye structure with 75 nm nano-column.(a) Mode 1; (b) Mode 2

    图 6  纳米柱不同半径时,牛眼结构的透射电场峰值

    Figure 6.  Transmitted electric field peaks of bullseye structures with different-radii nano-columns

    图 7  填充不同高度纳米柱时牛眼结构的透射率

    Figure 7.  Transmissions of bullseye structures with differentheight nano-columns

    图 8  填充不同高度的纳米柱时,牛眼结构在共振波长下的电场分布。(a) XOZ静态电场(λ=657 nm, h=20 nm);(b) XOY静态电场(λ=657 nm, h=20 nm);(c) XOZ静态电场(λ=659 nm, h=10 nm);(d) XOY静态电场(λ=659 nm, h=10 nm)

    Figure 8.  Electric field distributions of the bullseye structures with different-heights nano-columns at the resonance wavelengths.(a) XOZ electric field (λ=657 nm, h=20 nm); (b) XOY electric field (λ=657 nm, h=20 nm); (c) XOZ electric field (λ=659 nm, h=10 nm); (d) XOY electric field (λ=659 nm, h=10 nm)

    图 9  透射电场强度在不同高度纳米柱时的透射曲线

    Figure 9.  Transmitted electric field peaks of bullseye structures with different-heights nano-columns

    图 10  (a) 环境折射率不同时的结构透射率;(b)主透射峰波长与折射率的函数图

    Figure 10.  (a) Transmissions of the structure surrounded by different refractive index materials; (b) The graph of the main transmission peak's wavelength vs refractive index

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收稿日期:  2018-04-20
修回日期:  2018-06-08
刊出日期:  2018-11-01

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