Unidirectional scattering of Si ring-Au split ring nanoantenna excited by  tightly focused azimuthally polarized beam

Zhang Han-Mou; Xiao Fa-Jun; Zhao Jian-Lin

doi:10.7498/aps.71.20212212

Abstract

Unidirectional scattering of various plasmonic nanoantennas has been extensively studied, giving birth to applications such as in optical sensors, solar cells, spectroscopy and light-emitting devices. The directional scattering of magnetic nanoantenna is still unexplored, though it is beneficial to artificial magnetism applications including metamaterials, cloaking and nonlinear optical resonance. In this work, we numerically investigate the far-field scattering properties of the Si ring-Au split ring nanoantenna (Si R-Au SRN) excited by a tightly focused azimuthally polarized beam (APB) through using the finite-difference time-domain (FDTD) method. The results show that the magnetic resonant peaks with different widths can be deterministically excited in Si ring and Au split ring by tightly focusing APB. Owing to the plasmon hybridization effect, the two magnetic resonant modes form antibonding mode and bonding mode in the Si R-Au SRN. At a wavelength of λ=1064 nm, the destructive interference between the antibonding mode and bonding mode of nanostructure results in unidirectional far-field scattering in the transverse plane, which is affected dramatically by changes of geometrical parameters. Furthermore, the directional scattering of a dipole source is realized by the designed nanostructure, and its scattering directionality is superior to that excited with APB. Our work provides a flexible way to control the far-field scattering of nano-photon structures. We expect that this study can provide an avenue to the nano-light sources and optical sensors.

Keywords:

Authors and contacts

Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710029, China

Corresponding author: Xiao Fa-Jun, fjxiao@nwpu.edu.cn ; Zhao Jian-Lin, jlzhao@nwpu.edu.cn

Funds: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0303800), the National Natural Science Foundation of China (Grant Nos. 11634010, 11874050), the Shaanxi Provincial Key R&D Program, China (Grant No. 2021KW-19), and the Fundamental Research Fund for the Central Universities, China (Grant Nos. 3102019JC008, D5000210936).

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References

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Cited By

图 1 (a)三维和(b)二维直角坐标系中硅环-开口金环纳米天线结构及几何参数示意图

Figure 1. Schematic diagrams of Si R-Au SR nanoantenna with the geometrical parameters in (a) three-dimensional (3D) and (b) two-dimensional (2D) Cartesian coordinate systems.

DownLoad: Full-Size Img PowerPoint

图 2 紧聚焦角向矢量光在焦平面上(z = 0 nm)的电场和磁场分布　(a)电场(黑色箭头表示电场的偏振分布); (b)总磁场; (c)磁场面内分量(|H_t| = (|H_x|²+|H_y|²)^1/2); (d)磁场纵向分量. 白色虚线区域给出焦场中纳米结构的所在位置

Figure 2. Distributions of electric and magnetic fields at focal plane for tightly focused APB: (a) Electric field; (b) magnetic field; (c) in-plane component of magnetic field; (d) longitudinal component of magnetic field. The black arrows represent the distribution of polarization and white dot line regions denote the nano-structure.

DownLoad: Full-Size Img PowerPoint

图 3 紧聚焦角向矢量光激发下的(a)硅纳米环和(d)开口金纳米环的散射光谱, (b)硅纳米环和(e)开口金纳米环上表面(z = 50 nm)的磁场纵向分量(H_z)分布(箭头表示电流密度分布), 以及(c)硅纳米环及(f)开口金纳米环的远场散射分布

Figure 3. Scattering spectra of (a) Si ring and (d) Au split ring excited by tightly focused APB, magnetic field distributions of the upper surface (z = 50 nm) for (b) Si ring and (e) Au split ring at their resonant peaks (the current density distributions denoted by the black arrows), and far-field scattering patterns of (c) Si ring and (f) Au split ring, respectively.

DownLoad: Full-Size Img PowerPoint

图 4 (a) 硅环-开口金环纳米结构的模拟(红线)和拟合的散射谱(蓝色虚线); (b) 波长790, (c) 1200和(d) 1064 nm处, 结构上表面(z = 50 nm)的磁场纵向分量(H_z)分布(箭头表示电流密度分布)

Figure 4. (a) Calculated (red line) and fitted scattering spectra (blue dashed line) of the nanostructure. Magnetic field distributions of upper surface (z = 50 nm) for nano-structure at (b) 790, (c) 1200 and (d) 1064 nm, respectively (the white or black arrows represent the current density distributions).

DownLoad: Full-Size Img PowerPoint

图 5 紧聚焦角向光束激发下硅环-开口金环纳米结构在　(a)反键模式、(b)成键模式处, 以及(c)模式间的峰谷(λ = 1064 nm)的三维远场散射分布

Figure 5. 3D far-field scattering patterns of Si R-Au SRN at (a) the anti-bonding mode, (b) the bonding mode, and (c) λ = 1064 nm.

DownLoad: Full-Size Img PowerPoint

图 6 硅环-开口金环纳米结构反键与成键模式的(a)振幅比和(b)相位差随波长的变化

Figure 6. (a) Amplitude ratio and (b) phase difference of the two modes as a function of the wavelength for the Si R-Au SRN.

DownLoad: Full-Size Img PowerPoint

图 7 硅环-开口金环纳米结构在λ = 1064 nm的紧聚焦角向矢量光激发下, (a)硅环宽度w₁和(b)两环心间距d取不同值时, xy平面上的二维远场散射分布. 纳米结构的反键和成键模式的振幅比|C₁|/|C₂|和相位差Δϕ随(c)硅环宽度w₁和(d)两环心间距d的变化曲线

Figure 7. 2D far-field patterns on xy plane for Si R-Au SRN with different values of (a) the width of Si ring and (b) the distance between the centers of Si and Au rings. Changes of amplitude ratio and phase difference of the anti-bonging and bonding modes with respect to (c) the width of Si ring and (d) the distance between the centers of the two rings.

DownLoad: Full-Size Img PowerPoint

图 8 (a)电偶极子光源的激发配置图; (b)偶极光源及其激发下硅环-开口金环纳米结构在xy面上的二维远场发射(散射)分布; (c), (d)偶极光源和角向矢量光激发下纳米结构在xy和xz面的二维远场散射分布

Figure 8. (a) Schematic diagram of the Si R-Au SRN excited by an electric dipole; (b) 2D far-field patterns on xy plane of the dipole source and the Si R-Au SRN excited with the dipole source; (c), (d) 2D far-field patterns on xy and xz planes of the Si R-Au SRN excited by the dipole source and APB, respectively.

DownLoad: Full-Size Img PowerPoint

表 1 紧聚焦角向矢量光激发下硅环-开口金环纳米结构散射谱的耦合振子模型拟合参数

Table 1. Fitting coefficients of coupled-oscillator model for scattering spectrum of Si R-Au SRN excited by tightly focused APB

参数 ω₁/eV ω₂/eV γ₁/eV γ₂/eV η₁/eV η₂/eV g/eV E₀/eV I₀/arb.units

数值 1.5469 1.0445 0.0860 0.0651 0.0378 0.0103 0.0647 2.6384 0

DownLoad: CSV

[1]	Engheta N 2011 Science 334 317 Google Scholar
[2]	Taminiau T H, Stefani F D, Segerink F B, van Hulst N F 2008 Nat. Photonics 2 234 Google Scholar
[3]	Ahmed A, Gordon R 2012 Nano Lett. 12 2625 Google Scholar
[4]	Ahmed A, Pang Y, Hajisalem G, Gordon R 2012 Int. J. Opt. 2012 729138
[5]	Ou Y C, Webb J A, Faley S, Shae D, Talbert E M, Lin S, Cutright C C, Wilson J T, Bellan L M, Bardhan R 2016 ACS Omega 1 234 Google Scholar
[6]	Atwater H A, Polman A 2010 Nat. Mater. 9 205 Google Scholar
[7]	Anker J N, Hall W P, Lyandres O, Shah N C, Zhao J, Van Duyne R P 2008 Nat. Mater. 7 442 Google Scholar
[8]	Bharadwaj P, Deutsch B, Novotny L 2009 Adv. Opt. Photonics 1 438 Google Scholar
[9]	蒋双凤, 孔凡敏, 李康, 高辉 2011 物理学报 60 045203 Google Scholar Jiang S F, Kong F M, Li K, Gao H 2011 Acta Phys. Sin. 60 045203 Google Scholar
[10]	Maksymov I S, Staude I, Miroshnichenko A E, Kivshar Y S 2012 Nanophotonics 1 65 Google Scholar
[11]	Guo R, Decker M, Setzpfandt F, Staude I, Neshev D N, Kivshar Y S 2015 Nano Lett. 15 3324 Google Scholar
[12]	Curto A G, Volpe G, Taminiau T H, Kreuzer M P, Quidant R, van Hulst N F 2010 Science 329 930 Google Scholar
[13]	Vercruysse D, Sonnefraud Y, Verellen N, Fuchs F B, Di Martino G, Lagae L, Moshchalkov V V, Maier S A, Van Dorpe P 2013 Nano Lett. 13 3843 Google Scholar
[14]	Hancu I M, Curto A G, Castro-Lopez M, Kuttge M, van Hulst N F 2014 Nano Lett. 14 166 Google Scholar
[15]	Kerker M, Wang D S, Giles C L 1983 J. Opt. Soc. Am. 73 765 Google Scholar
[16]	Geffrin J M, Garcia-Camara B, Gomez-Medina R, Albella P, Froufe-Perez L S, Eyraud C, Litman A, Vaillon R, Gonzalez F, Nieto-Vesperinas M, Saenz J J, Moreno F 2012 Nat. Commun. 3 1171 Google Scholar
[17]	Fu Y H, Kuznetsov A I, Miroshnichenko A E, Yu Y F, Luk'yanchuk B 2013 Nat. Commun. 4 1527 Google Scholar
[18]	Person S, Jain M, Lapin Z, Saenz J J, Wicks G, Novotny L 2013 Nano Lett. 13 1806 Google Scholar
[19]	Ma C, Yan J, Huang Y, Yang G 2017 Adv. Opt. Mater. 5 1700761 Google Scholar
[20]	Neugebauer M, Woźniak P, Bag A, Leuchs G, Banzer P 2016 Nat. Commun. 7 11286 Google Scholar
[21]	Nechayev S, Eismann J S, Neugebauer M, Woźniak P, Bag A, Leuchs G, Banzer P 2019 Phys. Rev. A 99 041801 Google Scholar
[22]	Bag A, Neugebauer M, Wozniak P, Leuchs G, Banzer P 2018 Phys. Rev. Lett. 121 193902 Google Scholar
[23]	Bag A, Neugebauer M, Mick U, Christiansen S, Schulz S A, Banzer P 2020 Nat. Commun. 11 2915 Google Scholar
[24]	Linden S, Enkrich C, Wegener M, Zhou J F, Koschny T, Soukoulis C M 2004 Science 306 1351 Google Scholar
[25]	张富利, 赵晓鹏 2007 物理学报 56 4661 Google Scholar Zhang F L, Zhao X P 2007 Acta Phys. Sin. 56 4661 Google Scholar
[26]	Liu H, Genov D A, Wu D M, Liu Y M, Liu Z W, Sun C, Zhu S N, Zhang X 2007 Phys. Rev. B 76 073101 Google Scholar
[27]	Guo H C, Liu N, Fu L W, Meyrath T P, Zentgraf T, Schweizer H, Giessen H 2007 Opt. Express 15 12095 Google Scholar
[28]	Liu N, Kaiser S, Giessen H 2008 Adv. Mater. 20 4521 Google Scholar
[29]	Yang Z J, Zhang Z S, Hao Z H, Wang Q Q 2012 Opt. Lett. 37 3675 Google Scholar
[30]	Ye J, Kong Y, Liu C 2016 J. Phys. D:Appl. Phys. 49 205106 Google Scholar
[31]	Zhang D, Xiang J, Liu H F, Deng F, Liu H Y, Ouyang M, Fan H H, Dai Q F 2017 Opt. Express 25 26704 Google Scholar
[32]	Bao Y J, Hu Z J, Li Z W, Zhu X, Fang Z Y 2015 Small 11 2177 Google Scholar
[33]	Shegai T, Chen S, Miljkovic V D, Zengin G, Johansson P, Kall M 2011 Nat. Commun. 2 481 Google Scholar
[34]	Youngworth K, Brown T 2000 Opt. Express 7 77 Google Scholar
[35]	Palik E D 1991 Handbook of Optical Constants of Solids (Boston: Academic Press)
[36]	Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370 Google Scholar
[37]	Woźniak P, Banzer P, Leuchs G 2015 Laser Photonics Rev. 9 231 Google Scholar
[38]	Prodan E, Radloff C, Halas N J, Nordlander P 2003 Science 302 419 Google Scholar
[39]	Lovera A, Gallinet B, Nordlander P, Martin O J 2013 ACS Nano 7 4527 Google Scholar
[40]	Shang W Y, Xiao F J, Zhu W R, He H S, Premaratne M, Mei T, Zhao J L 2017 Sci. Rep. 7 1049 Google Scholar
[41]	Yang Z J, Zhao Q, He J 2017 Opt. Express 25 15927 Google Scholar

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