Research progress of plasmonic nanofocusing

Li Pan

doi:10.7498/aps.68.20190564

Abstract

Surface plasmons (SPs) are the surface waves of collective oscillations of free electrons at metal-dielectric interface, which have the ability to overcome the diffraction limit and to enhance the giant near-field. Tapered metallic nanostructures that support surface plasmons’ propagation are highly attractive to nanophotonic applications because of their waveguiding and field-focusing properties. This distinct morphologic feature enables the functionality known as nanofocusing. As a result, the plasmons can be guided in these nanostructures and finally focused on the sharp apex to greatly enhance the local field. This attractive effect can be widely used for effective remote-excitation detection/sensing. In this paper, we review various types of plasmonic nanofocusing structures operating in the visible and infrared region. We focus on their fundamentals, fabrications, and applications. Firstly, we discuss the mechanisms of the plasmonic nanofocusing. Then, the characteristics of various tapered metallic nanostructures of SPs are reviewed, including on-chip waveguides, metal tips and bottom-up fabricated nanowires. For applications, some prototypes of plasmonic nanofocusing for bio/chemo sensing are demonstrated. Finally, a summary and outlook of plasmonic waveguides are given.

Keywords:

Authors and contacts

Li Pan

Beijing Key Laboratory for Nano-Photonics and Nano-Structure (NPNS), Department of Physics, Capital Normal University, Beijing 100048, China

Corresponding author: Li Pan, lipan01@cnu.edu.cn

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Cited By

图 1 纳米聚焦原理　(a) 空间光与金属表面等离激元色散关系对比^[44]; (b) m = 0模式波矢与波导半径的依赖关系^[29]; (c) 锥形波导上传播表面等离激元近场强度分布^[27]

Figure 1. Mechanism of the nanofocusing: (a) Dispersion relations for spatial light and surface plasmons^[44]; (b) real part of the effective refractive index for the m = 0 mode as a function of the waveguide radius^[29]; (c) near field distribution of tapered waveguide^[27].

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图 2 纳米带波导　(a) 锥形金纳米带波导电镜图, 标尺为2 μm^[35]; (b) 纳米带波导锥形结构电镜图, 标尺为200 nm^[35]; (c) 锥形金纳米带波导表面等离激元传输的近场强度及相位的扫描成像, 标尺为1 μm^[35]; (d) 锥形金纳米带波导增强上转换荧光成像, 其中(i)−(iii)分别对应波导的光学显微镜成像(i), 波长为660 nm的上转换荧光成像(ii) 以及波长为550 nm的上转换荧光成像(iii), 标尺为10 μm^[48]; (e) V形金属薄膜波导电镜图^[49]; (f) V形纳米结构金属薄膜波导增强量子点发光, 波导的光学成像(左侧), 量子点荧光成像(右侧)^[49]; (g) 金属薄膜波导尖端处量子点荧光强度与该位置纳米间隙宽度的关系^[49]; (h) 硅波导与V形纳米结构金属薄膜耦合结构近场分布的模拟计算结果^[50]

Figure 2. Nanostripes for nanofocusing waveguides: (a) SEM image of a fabricated tapered-stripe waveguide^[35]; (b) zoomed-in tapered part of the waveguide, showing a taper and an antenna, scale bars correspond to 2 μm in (a) and 200 nm in (b)^[35]; (c) SNOM images of topography y, measured SNOM near-field (amplitude |E| and phase Arg[E]), scale bars correspond to 1 μm^[35]; (d) spatially resolved photoluminescence maps of Er upconversion emission, scale bars correspond to 10 μm^[48]; (e) SEM images of a hybrid gap plasmon waveguide^[49]; (f) optical image of the waveguide (left) and image of quantum dots emission (right)^[49]; (g) enhancement factor of the quantum dots fluorescent and plasmon propagation length as a function of the gap width^[49]; (h) calculated average electromagnetic field intensity within a hybrid silicon-metal nanowaveguide^[50].

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图 3 MIM纳米聚焦波导　(a) MIM纳米聚焦波导示意图; (b) MIM纳米聚焦波导电镜图; (c) MIM纳米聚焦波导不同激发方式的多光子荧光成像, 其中红点表示激发光位置; (d) 表面等离激元在MIM波导上传播的强度分布探测与理论模拟结果 (本图内容引用自文献[37])

Figure 3. MIM nanofocusing waveguide: (a) Schematic illustration of a MIM nanofocusing waveguide; (b) SEM image of a fabricated waveguide; (c) images of photoluminescence emission for four different excitation positions, red dots indicate the positions of excitation; (d) photoluminescence mapping of the near-field on the waveguide and top-view SEM image of the characterized sample and simulated near field intensity profile. Reproduced from Ref. [37].

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图 4 金属针尖用于制备扫描探针　(a) 金属针尖纳米聚焦波导的电镜及表面等离激元发光成像^[42]; (b) 金属针尖作为近场扫描探针探测金纳米颗粒^[43]; (c) 纳米聚焦效应增强针尖二次谐波探测^[31]; (d) 飞秒脉冲激发针尖表面等离激元发射光谱, 脉冲时间16 fs, 发射峰半高宽60 nm, 光谱包括了发射光相位(蓝)、强度(红)和场强的时间分辨(绿)的信息^[31]

Figure 4. Metal tip as scanning probe: (a) Overlay of SEM and optical far-field image of a Au tip with grating for surface plasmon coupling of incident light^[42]; (b) two-dimensional optical images of individual gold nanoparticles on a glass substrate recorded by near field optical microscopy^[43]; (c) measurements based on apex localized SHG of adiabatically nanofocused surface plasmons^[31]; (d) emission spectrum yields a 16 fs pulse for a 60 nm fwhm bandwidth with reconstructed spectral and temporal phase (blue), intensity (red), as well as the reconstructed temporal electric field transient (green)^[31].

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图 5 金属探针激发电子射线　(a) 金属针尖发射超快电子射线示意图^[52]; (b) 实验装置图^[52]; (c) 激发光光谱能量密度分布^[52]; (d) 超快电子射线扫描纳米碳管成像^[53]; (e) 纳米碳管超快电子射线扫描成像中, 由于电子干涉形成条纹状的信号强度分布^[53]

Figure 5. Metal nanotip for electron emitting: (a) SEM image of a gold tip with a grating coupler 20 μm away from the apex with illustration of surface plasmon nanofocusing exciting ultrafast electron emission^[52]; (b) corresponding electron pulse imaging setup using a 5 fs laser system for surface plasmon excitation^[52]; (c) normalized spectral power density (SPD) of the ultrabroad band spectrum of the laser system^[52]; (d) electrostatic field electron emission image a carbon nanotube^[53]; (e) cross section along the white dashed line shown in (d), several interference fringes (black dots) are clearly visible^[53].

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图 6 锥形纳米线光催化合成　(a) 微区汇聚光场催化反应示意图; (b) 反应产物的暗场光学成像; (c) 产物扫描电镜成像; (d) 合成的锥形银纳米线样品的扫描电镜成像; (e) 锥形纳米线直径分布的测量 (本图引用自文献[68])

Figure 6. Laser-induced synthesis of tapered nanowires: (a) Schematic of the experimental setup; (b) dark-field optical image of the products, the white circle indicates the size of the laser spot; (c) SEM image of the products shown in (b); (d) close-up of a nanowire indicated by the yellow square in (c); (e) transverse diameter as a function of positions along the nanowire. Reproduced from Ref. [68].

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图 7 锥形纳米线表面等离激元传输特性　(a) 锥形纳米线扫描电镜成像, 标尺长度为 2 µm; (b) 纳米线表面等离激元传导远场光学成像, 激发光波长633 nm, 箭头表明激发光偏振方向; (c) 纳米线表面等离激元传导近场量子点荧光成像; (d) 锥形纳米线近场分布理论计算; (e) 传播模式的有效折射率与纳米线直径的关系; (f) 波节长度与纳米线直径的理论计算与实验数据图 (本图引用自文献[68])

Figure 7. Near-field distributions of surface plasmons in tapered nanowires: (a) SEM image of a silver nanowire, the scale bar is 2 µm in length; (b) optical image of the nanowire under excitation of a focused laser beam at the thicker end, the incident polarization is marked by the green arrow; (c) quantum dots emission image of the nanowire; (d) calculated electric field distribution of propagating plasmons along the nanowire; (e) calculated effective refractive indices, n_H0 and n_H2, for the H₀ and H₂ modes as a function of the diameter; (f) beat length as a function of needle diameter, the black curve represents the calculated result using the effective refractive indices in (e), and the dots represent the experimental data with the diameter being the average value for each observed beat length. Reproduced from Ref. [68].

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图 8 纳米聚焦探针组装　(a) 锥形银纳米线通过光纤操控转移; (b), (c) 锥形纳米线探针的组装; (d) 通过光纤激发等离激元在纳米线探针上的传输及汇聚, 激发光波长532 nm, 图中的NN表示纳米针(nanoneedle) (本图引用自文献[68])

Figure 8. Install a tapered nanowire onto optical fiber for scanning probe: (a) Optical bright field image of the synthesized naonowire and a tapered optical fiber controlled by oil hydraulic micromanipulator; (b), (c) pick up and install the synthesized needle into a tapered optical fiber; (d) launch SPs in the nanowire via optical fiber by “end-fired” configuration, a bright emission spot at the apex of the nanoneedle is clearly observed, the wavelength of the excitation light is 532 nm. Reproduced from Ref. [68].

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图 9 锥形纳米线用于纳米聚焦表面增强拉曼散射　(a) 用于远程激发拉曼增强的锥形纳米线电镜图; (b) 远程激发CV分子拉曼散射, 入射光波长633 nm, 偏振方向: 平行(红), 垂直(黑) (本图引用自文献[68])

Figure 9. Tapered nanowire for nanofocusing SERS: (a) SEM image of a tapered nanowire for remote SERS excitation, the SPs propagation is launched at thick end, the remote-excitation nanofocusing SERS is detected at the thin end; (b) remote-excitation nanofocusing SERS of CV molecule under the longitudinal (red) and transverse polarization (black). Reproduced from Ref. [68].

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图 10 纳米聚焦增强拉曼光谱探针　(a), (b) 原子力显微镜悬臂上的纳米探针扫描电镜图^[39]; (c) 纳米聚焦探针用于硅-石英基底的拉曼增强信号的扫描成像^[39]; (d) 疏水表面被测分子汇聚于探针位置^[38]; (e) 疏水表面及纳米聚焦探针的扫描电镜图^[38]; (f) 纳米聚焦探针增强分子拉曼散射示意图^[38]

Figure 10. Probes of the nanofocusing SERS: (a), (b) SEM image of the device fabricated on a set of silicon nitride AFM cantilevers^[39]; (c) Raman signal mapping at 520 cm^–1 from a representative scanning area across a silicon nanocrystal/ SiOx step boundary^[39]; (d) the sliding and evaporation mechanism of the drop on the super-hydrophobic surface^[38]; (e) SEM images of the super-hydrophobic device with embedded plasmonic nanofocusing device^[38]; (e) schematic of the nanofocusing SERS measurements^[38].

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图 11 量子效率增强　(a) 纳米锥激发表面等离激元增强量子点荧光示意图; (b) 量子点荧光强度分布; (c) 量子点荧光寿命探测, 纳米锥激发(黑), 光纤激发(红) (本图引用自文献[94])

Figure 11. Enhancement of the quantum efficiencies: (a) Schematics of the excitation and the detection of quantum dot fluorescence on a metal nanocone, the panels in the lower part show the spectra of the plasmon resonance (black, centered at 625 nm) and quantum dot emission (red); (b) fluorescence signal recorded from a quantum dot as a function of its position with respect to the nanocone; (c) fluorescence lifetime decay curves of a quantum dot on glass (black) and at the end of a glass fiber tip (red). Reproduced from Ref. [94].

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