Broadband enhancement of spontaneous emission by optical dipole nanoantenna on metallic substrate: An intuitive model of surface plasmon polariton

Zhang Lian; Wang Hua-Yu; Wang Ning; Tao Can; Zhai Xue-Lin; Ma Ping-Zhun; Zhong Ying; Liu Hai-Tao

doi:10.7498/aps.70.20212290

Abstract

Optical nanoantennas can achieve electromagnetic-field enhancement under far-field excitation or spontaneous-emission enhancement under excitation by radiating emitters. Among them, nanoantennas on a metallic substrate (i.e. the so-called nanoparticle-on-mirror antennas) have aroused great research interest due to their ease in forming metallic gaps of sizes down to a few nanometers or even subnanometer. Here we propose an optical dipole nanoantenna on a metallic substrate with a broadband enhancement of spontaneous emission. Its total and radiative emission-rate enhancement factors can reach up to 5454 and 1041, respectively. In the near-infrared band, the wavelength range of spontaneous-emission enhancement (Purcell factor over 1000) can reach 260nm. By changing the width of the slit between the two antenna arms and also the length of the antenna arms, the spontaneous-emission enhancement bandwidth and enhancement factors can be adjusted, respectively, which brings great freedom and simplicity to the design process. The antenna can achieve a strong far-field radiation within a central anglular zone (polar angle θ≤60°) corresponding to a certain numerical aperture of objective lens, and therefore can increase the intensity of the fluorescence collected by the objective lens. Based on the above performances, the antenna can provide a broadband enhancement of spontaneous emission for fluorescent molecules or quantum dots (whose fluorescence spectrum usually covers a certain wavelength range), which is of great significance for the applications such as in high-speed and super-bright nanoscale light sources and high-sensitivity fluorescent-molecule sensing.To clarify the underlying physical mechanisms, we build up a semi-analytical model by considering an intuitive excitation and multiple-scattering process of surface plasmon polaritons (SPPs) that propagate along the antenna arms. All the parameters used in the model (such as the SPP scattering coefficients) are obtained via rigorous calculations based on the first principle of Maxwell's equations without any fitting process, which ensures that the model has a solid electromagnetic foundation and can provide quantitative predictions. The SPP model can comprehensively reproduce all the radiation properties of the antenna, such as the total radiative emission rate and the far-field radiation pattern. Two phase-matching conditions are derived from the model for predicting the antenna resonance, and show that under these conditions, the SPPs on the antenna arms form a pair of Fabry-Perot resonance and therefore are enhanced, and the enhanced SPPs propagate to the emitter in the nanogap (or scattered into the free space), so as to enhance the total spontaneous emission rate (or the far-field radiative emission rate). Besides, this pair of Fabry-Perot resonance results in a pair of resonance peaks close to each other, then enhancing the spontaneous emission with a broadband.

Keywords:

Authors and contacts

1.
Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
2.
Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China
3.
College of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, China
4.
State Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China

Corresponding author: Liu Hai-Tao, liuht@nankai.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 62075104, 61775105).

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References

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Cited By

图 1 (a) 金基底上金偶极纳米天线结构示意图; (b1), (b2) 对称点源和反对称点源激励下, SPP模型中的SPP模式系数$a_{\rm sym/asym}^{+/-} $, $b_{\rm sym/asym}^{+/-} $, $c_{\rm sym/asym}^{+/-} $, $d_{\rm sym/asym}^{+/-} $的定义; (c)—(e) SPP模型中用到的SPP散射系数ρ, τ, r, β以及电磁场${\boldsymbol{ \varPsi}} _{{{\rm{SPP, + }}}}^{{{\rm{gap{\text{-}}scattering}}}}$, ${\boldsymbol{ \varPsi}} _{{{\rm{SPP, + }}}}^{{{\rm{end{\text{-}}scattering}}}} $, Ψ_source的定义

Figure 1. (a) Schematic diagram of the gold dipole nanoantenna on a gold substrate; (b1), (b2) definition of the SPP mode coefficients $a_{\rm sym/asym}^{+/-} $, $b_{\rm sym/asym}^{+/-} $, $c_{\rm sym/asym}^{+/-} $, $d_{\rm sym/asym}^{+/-} $ in the SPP model under excitation by symmetric and anti-symmetric point sources; (c)−(e) definition of the SPP scattering coefficients ρ, τ, r, β and electromagnetic fields ${\boldsymbol{ \varPsi}} _{{{\rm{SPP, + }}}}^{{{\rm{gap{\text{-}}scattering}}}} $, ${\boldsymbol{ \varPsi}} _{{{\rm{SPP, + }}}}^{{{\rm{end{\text{-}}scattering}}}} $, Ψ_source used in the SPP model.

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图 2 在y-z横截面上SPP基模式电场分量的模值(|E_x|, |E_y|, |E_z|), 在(y, z) = (0, H/2)处满足归一化E_z = 1. 图中叠加的虚线显示了结构的边界

Figure 2. Moduli of the electric-field components (|E_x|, |E_y|, |E_z|) on the y-z cross section for the fundamental SPP mode satisfying normalization E_z = 1 at (y, z) = (0, H/2). The superimposed dashed lines show the boundaries of the structure.

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图 3 在单个点源激励下, 偶极纳米天线的归一化总辐射速率Γ_tot/Γ_PMMA((a1), (a2))和归一化远场辐射速率Γ_rad/Γ_PMMA((b1), (b2)), 显示为点源辐射波长λ的函数. 结果分别采用a-FMM严格计算(圆圈)和SPP模型(实线)得到. (a1), (b1)天线臂长L = L_{res, 1} = 126 nm. (a2), (b2) L = L_{res, 2} = 272 nm. 不同天线臂间狭缝宽度w对应不同颜色的曲线. 灰色曲线对应单臂纳米天线的结果. 竖直点划线显示了方程(10)预测的谐振波长

Figure 3. Normalized total emission rate Γ_tot/Γ_PMMA ((a1), (a2)) and normalized radiative emission rate Γ_rad/Γ_PMMA ((b1), (b2)) of the dipole nanoantenna under a single point-source excitation plotted as functions of the excitation wavelength λ. The results are obtained with the rigorous a-FMM calculation (circles) and the SPP model (solid curves), respectively. (a1), (b1) Antenna arm length L = L_{res, 1} = 126 nm. (a2), (b2) L = L_{res, 2} = 272 nm. Different widths w of the slit between the antenna arms correspond to curves of different colors. The gray curves show the results of a single-arm nanoantenna. The vertical dash-dot lines show the resonant wavelengths predicted by Equation (10).

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图 4 偶极纳米天线谐振波长λ_res随狭缝宽度w变化的曲线. 图中λ_{res, sym} = λ_{res, 1}, λ_{res, asym} = λ_{res, 2}, λ_{res, 1}, λ_{res, 2}为图3中γ_T或γ_R的谐振波长. 方形、圆圈为a-FMM严格计算结果. 实线、虚线为SPP模型方程(10)预测的结果. 红色、蓝色曲线对应天线臂长L = L_{res, 1} = 126 nm [对应方程(10)中M = N = 1], 洋红、青蓝色曲线对应L = L_{res, 2} = 272 nm(对应M = N = 2). 水平点划线为方程(A5)预测的单臂纳米天线的谐振波长

Figure 4. Resonant wavelength λ_res of the dipole nanoantenna plotted as a function of the slit width w. There are λ_{res, sym} = λ_{res, 1} and λ_{res, asym} = λ_{res, 2}, with λ_{res, 1} and λ_{res, 2} being the resonant wavelengths of γ_T or γ_R shown in Figure 3. The squares and circles show the results obtained with the rigorous a-FMM calculation. The solid and dashed curves show the predictions of the SPP model Equation (10). The red and blue curves correspond to the antenna arm length L = L_{res, 1} = 126 nm (obtained for M = N = 1 in Equation (10)). The magenta and cyan curves correspond to L = L_{res, 2} = 272 nm (obtained for M = N = 2). The horizontal dash-dot line shows the resonant wavelength of the single-arm nanoantenna predicted by Equation (A5).

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图 5 单个点源激励下, 天线纳米间隙内(z = H下1 nm截面上)主要电场分量E_z的近场分布　(a1), (a2), (b1), (b2) 天线臂长L = L_{res, 1} = 126 nm, λ_{res, sym} = 0.97 μm, λ_{res, asym} = 1.10 μm (分别对应方程(10)中M = 1和N = 1); (c1), (c2), (d1), (d2) L = L_res,2 = 272 nm, λ_res,sym = 0.99 μm, λ_{res, asym} = 1.05 μm (分别对应M = 2和N = 2); (a1)—(d1) 显示了Re(E_z); (a2)—(d2) 显示了|E_z|. E_z做了归一化(除以Γ_PMMA)

Figure 5. Near-field distribution of the main electric-field component E_z in the antenna nanogap (on the cross-section of 1 nm below z = H) under excitation by a single point source: (a1), (a2), (b1), (b2) For antenna arm length L = L_res,1 = 126 nm and wavelengths λ_res,sym = 0.97 μm, λ_res,asym = 1.10 μm (respectively corresponding to M = 1 and N = 1 in Equation (10)); (c1), (c2), (d1), (d2) for L = L_res,2 = 272 nm and λ_{res, sym} = 0.99 μm, λ_{res, asym} = 1.05 μm (respectively corresponding to M = 2 and N = 2); (a1)−(d1) show Re(E_z); (a2)−(d2) show |E_z|. E_z is normalized (divided by Γ_PMMA).

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图 6 在单个点源激励下, 偶极纳米天线的远场辐射角分布P(θ, ϕ). 计算选取图4中天线臂长L = L_{res, 1} = 126 nm, 以及不同的天线臂间狭缝宽度w对应的谐振波长λ_{res, sym}(第1, 2列), λ_{res, asym}(第3, 4列) (a1)—(a4) w = 5 nm, λ_{res, sym} = 0.96 μm, λ_{res, asym} = 1.2 μm; (b1) —(b4) w = 15 nm, λ_{res, sym} = 0.98 μm, λ_{res, asym} = 1.06 μm; (c1)—(c4) w = 35 nm, λ_{res, sym} = 0.99 μm, λ_{res, asym} = 1.02 μm. 叠加的圆和径向线分别对应极角θ和方位角ϕ

Figure 6. Angular distributions P(θ, ϕ) of the far-field emission for the dipole nanoantenna under excitation by a single point source. The calculations are for antenna arm length L = L_{res, 1} = 126 nm and resonance wavelengths λ_{res, sym} (columns 1 and 2) and λ_{res, asym} (columns 3 and 4) corresponding to different widths w of the slit between the antenna arms (as shown in Fig. 4). (a1)−(a4) w = 5 nm, λ_{res, sym} = 0.96 μm, λ_{res, asym} = 1.2 μm; (b1)−(b4) w = 15 nm, λ_{res, sym} = 0.98 μm, λ_{res, asym} = 1.06 μm; (c1)−(c4) w = 35 nm, λ_{res, sym} = 0.99 μm, λ_{res, asym} = 1.02 μm. The superimposed circles and radial lines correspond to the polar angle θ and azimuth angle ϕ, respectively.

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图 A1 (a) 金基底上单臂纳米天线示意图; (b) 在单个点源激励下, SPP模型中SPP模式系数a₁, a₂, b₁, b₂的定义; (c) 归一化总辐射速率Γ_tot/Γ_PMMA(蓝色曲线)和归一化远场辐射速率Γ_rad/Γ_PMMA(红色曲线)随天线臂长L变化的曲线(固定波长λ = 1 μm). 圆圈和实线分别为全波a-FMM, SPP模型的结果. 竖直绿色虚线显示了方程(A5)确定的发生谐振的L

Figure A1. (a) Schematic diagram of a single-arm nanoantenna on a gold substrate; (b) definition of the SPP mode coefficients a₁, a₂, b₁, b₂ in the SPP model under a single point-source excitation; (c) normalized total emission rate Γ_tot/Γ_PMMA (blue curves) and normalized radiative emssion rate Γ_rad/Γ_PMMA (red curves) of the antenna plotted as functions of the antenna arm length L (for fixed wavelength λ = 1 μm). The circles and solid curves show the results of the full-wave a-FMM and SPP model, respectively. The vertical green dashed lines show the L at resonance determined by Equation (A5).

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图 B1 偶极天线棱边、棱角圆角化后的俯视图(a)、侧视图(b). 图中红点代表辐射点源

Figure B1. Top view (a) and side view (b) of the dipole antenna with rounded edges and corners. The red dot represents the emission point source.

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图 B2 对于不同圆角化半径R的偶极天线(对应不同颜色的曲线), 在单个点源激励下, 归一化总辐射速率Γ_tot/Γ_PMMA (a)和归一化远场辐射速率Γ_rad/Γ_PMMA (b)随波长λ变化的曲线. 计算采用a-FMM(红色曲线)和FEM(粉色、青色、蓝色曲线). 选取天线臂长L = L_res,1 = 126 nm, 臂间狭缝宽度w = 10 nm

Figure B2. For the dipole antenna with different radii R of rounded edges and corners (corresponding to curves of different colors), the normalized total emission rate Γ_tot/Γ_PMMA (a) and normalized radiative emission rate Γ_rad/Γ_PMMA (b) under excitation by a single point source, which are plotted as functions of wavelength λ. The calculation is performed with the a-FMM (red curves) and the FEM (pink, cyan, and blue curves). The antenna arm length is L = L_res,1 = 126 nm, and the width of the slit between the antenna arms is w = 10 nm.

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[2]	Novotny L, Van Hulst N 2011 Nat. Photonics 5 83 Google Scholar
[3]	Pelton M 2015 Nat. Photonics 9 427 Google Scholar
[4]	Şendur K, Baran E 2009 Appl. Phys. B 96 325 Google Scholar
[5]	Sederberg S, Elezzabi A Y. 2011 Opt. Express 19 10456 Google Scholar
[6]	El-Toukhy Y M, Hussein M, Hameed M F O, Obayya S S A 2018 Plasmonics 13 503 Google Scholar
[7]	Aizpurua J, Bryant G W, Richter L J, García de Abajo F J, Kelley B K, Mallouk T 2005 Phys. Rev. B 71 235420 Google Scholar
[8]	Yong Z D, Zhang S L, Dong Y J, He S L 2015 Prog. Electromagnet. Res. 153 123 Google Scholar
[9]	Lu G W, Liu J, Zhang T Y, Shen H M, Perriat P, Martini M, Tillement O, Gu Y, He Y B, Wang Y W, Gong Q H 2013 Nanoscale 5 6545 Google Scholar
[10]	Akselrod G M, Argyropoulos C, Hoang T B, Ciracì C, Fang C, Huang J N, Smith D R, Mikkelsen M H 2014 Nat. Photonics 8 835 Google Scholar
[11]	Hoang T B, Akselrod G M, Argyropoulos C, Huang J, Smith D R, Mikkelsen M H 2015 Nat. Commun. 6 7788 Google Scholar
[12]	Kinkhabwala A, Yu Z H, Fan S H, Avlasevich Y, Müllen K, Moerner W E 2009 Nat. Photonics 3 654 Google Scholar
[13]	Muskens O L, Giannini V, Sánchez-Gil J A, Gómez Rivas J 2007 Nano Lett. 7 2871 Google Scholar
[14]	Baibakov M, Patra S, Claude J-B, Moreau A, Lumeau J, Wenger J 2019 ACS Nano 13 8469 Google Scholar
[15]	Barulin A, Claude J-B, Patra S, Bonod N, Wenger J 2019 Nano Lett. 19 7434 Google Scholar
[16]	Rycenga M, Xia X H, Moran C H, Zhou F, Qin D, Li Z Y, Xia Y N 2011 Angew. Chem. Int. Ed. 50 5473 Google Scholar
[17]	Nie S, Emory S R 1997 Science 275 1102 Google Scholar
[18]	Lodahl P, Mahmoodian S, Stobbe S 2015 Rev. Mod. Phys. 87 347 Google Scholar
[19]	Tsakmakidis K L, Boyd R W, Yablonovitch E, Zhang X 2016 Opt. Express 24 17916 Google Scholar
[20]	Suh J Y, Kim C H, Zhou W, Huntington M D, Co D T, Wasielewski M R, Odom T W 2012 Nano Lett. 12 5769 Google Scholar
[21]	Ma R-M, Oulton R F, Sorger V J, Zhang X 2013 Laser Photonics Rev. 7 1 Google Scholar
[22]	Harutyunyan H, Volpe G, Quidant R, Novotny L 2012 Phys. Rev. Lett. 108 217403 Google Scholar
[23]	Butet J, Martin O J F 2015 Plasmonics 10 203 Google Scholar
[24]	Gong T X, Guan F, Wei Z J, Huang W, Zhang X S. 2021 Front. Phys-Lausanne 9 691027 Google Scholar
[25]	Zhang W H, Huang L N, Santschi C, Martin O J F 2010 Nano Lett. 10 1006 Google Scholar
[26]	Fischer H, Martin O J F 2008 Opt. Express 16 9144 Google Scholar
[27]	Yong Z D, Gong C S, Dong Y J, Zhang S L, He S L 2017 RSC Adv. 7 2074 Google Scholar
[28]	Trojak O J, Park S I, Song J D, Sapienza L 2017 Appl. Phys. Lett. 111 021109 Google Scholar
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