Pronounced Fano Resonance in Single Gold Split Nanodisks with 15 nm Split Gaps for Intensive Second Harmonic Generation

Zhang, Shi; Li, Guang Can; Chen, Yiqin; Zhu, Xing; Liu, Shao‐Ding; Lei, Dangyuan; Duan, Huigao

doi:10.1021/acsnano.6b05979

Cited by 142 publications

(95 citation statements)

References 68 publications

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“…Meanwhile, the resonant frequency decreases with the reduction of μ c3 . It should be noted that the bonding/anti-bonding state of the dimmer may be changed during the mode evolution procedure [35]. As for the modes which are symmetric with respect to the X axis, [|+1>x,|+1>y] and [|+1>x,|−1>y], there is also an avoid-crossing point at around 0.4 eV, which is shown in Figure 6.…”

Section: Resultsmentioning

confidence: 98%

“…Meanwhile, the resonant frequency decreases with the reduction of µ c3 . It should be noted that the bonding/anti-bonding state of the dimmer may be changed during the mode evolution procedure [35]. In this region, the plasmonic mode of the left disk remains stable in the TM1,1 mode, and the mode of the right disk is weakened first and then enhanced; also, the TM2,1 mode is switched to the TM3,1 mode.…”

Section: Resultsmentioning

confidence: 99%

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Mode Coupling Properties of the Plasmonic Dimers Composed of Graphene Nanodisks

Chen

Qiu

et al. 2017

Applied Sciences

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Abstract:The electromagnetic properties of the plasmonic dimer composed of coupled graphene nanodisks are numerically investigated in this paper. The results demonstrate that the degeneracy of the plasmonic modes of the dimer is lifted when the coupling is introduced. The evolution of the plasmonic mode, with the variation of inter-disk distance and the chemical potential of one of the nanodisks, is studied. The proposed structure might find broad areas of application including light-matter interaction, optical switching, directional emission of the plasmonic emitter, etc.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Mode Coupling Properties of the Plasmonic Dimers Composed of Graphene Nanodisks

Chen

Qiu

et al. 2017

Applied Sciences

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“…Note that the surface modification of the antiadhesion monolayer is realized by a vapor-based process instead of a wet treatment to avoid collapse of the HSQ nanowall templates. [20] From the SEM images shown in Figure 2b-d, uniform gap and slit with dimensions of ≈15 nm can be obtained. A smaller nanogap size between Al nanostructures promotes the plasmon coupling effect to modulate their optical properties.…”

Section: Resultsmentioning

confidence: 99%

Adhesion‐Engineering‐Enabled “Sketch and Peel” Lithography for Aluminum Plasmonic Nanogaps

Chen

Zhang

Shu

et al. 2019

Advanced Optical Materials

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in the near field and amplify both linear and nonlinear phenomena at the singlemolecule and single-particle level. [5][6][7][8][9] Choosing an appropriate plasmonic material is significant for different plasmonic applications, usually considering the cost, performance, and process compatibility. Among these materials, silver (Ag) is favored due to its low loss, which supports a strong plasmon resonance in the visible and near-infrared regions. [10] However, the oxidization of Ag in air greatly changes its optical properties, which severely limits the practical use of metallic Ag in plasmonics. In contrast, gold (Au) is a better choice due to its excellent chemical stability, but it suffers from a high intrinsic absorption of photon energy higher than 2.38 eV. As a result, making full use of Au for plasmon-enhanced spectroscopic applications, such as surface-enhanced Raman spectroscopy (SERS) and nonlinear optics in the entire visible region, is difficult.Compared to Au and Ag, aluminum (Al) is a more promising material for plasmonics, with the merits of oxidation stability superior to that of Ag and the extended optical response ranging from the ultraviolet to visible regime compared to that of Au. [11,12] Nevertheless, the optical loss of Al degrades the nanofocusing effect, which weakens the localization of light field in the nearfield of Al plasmonic nanostructures. For these reasons, tiny plasmonic nanogaps play a significant role in achieving large electric-field enhancement factor for practical applications of Al plasmonics.From the perspective of fabrication process, the plasmonic nanogaps in metallic structures are intrinsically a type of multiscale configuration, usually ranging from several nanometers to several hundreds of nanometers. To obtain plasmonic nanogaps, electron-beam lithography (EBL) is a key tool due to its advantages of high resolution and accuracy in patterning. [13,14] Traditionally, the whole area of final patterns separated by nanogaps should be fully exposed. However, this patterning strategy has limited resolution and accuracy in gap fabrication due to the large proximity effect caused by electron scattering. Furthermore, this kind of challenge becomes more apparent when fabricating nanogaps in plasmonic nanostructures, which commonly involves metal deposition and lift-off processes.Aluminum is one of the most significant plasmonic materials for its advantage of low cost, natural abundance, as well as the ultraviolet optical response. However, it is still very challengeable for the fabrication of aluminum plasmonic nanogaps, which greatly limits the applications of aluminum plasmonics considering the essential role of nanogaps for electric field enhancement. Here, the reliable patterning of aluminum plasmonic nanogaps employing a modified "Sketch and Peel" lithography strategy is demonstrated. By introducing a self-assembled monolayer to engineer the surface energy of the substrate, the adhesiveness of the aluminum film outside outline template is significantly decreased to implemen...

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“…We have the following mechanisms to explain the spectroscopic response of the dual-phase gold nanostructures: (1) the size-dependence of the plasmonic nanostructures, which is determined by the height (H), the diameter (D), and the value of H/D. A larger value of H/D corresponds to a blue-shift of plasmon resonance of gold nanoparticles [25,26]. Gold nanoparticles on the F8BT-and PFB-rich phases have larger differences in H, D, and H/D, resulting in LSPR in the visible and in the infrared, respectively; (2) the environmental dielectric constants (ε).…”

Section: Optical Spectroscopic Performancementioning

confidence: 99%

Broadband Dual-Phase Plasmons through Metallization of Polymeric Heterojunctions

Huang

2017

Metals

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Large-area dual-phase plasmonic gold nanostructures were produced using the phase-separation pattern of a polymer blend film, where two typical light-emitting polymeric semiconductors of poly (9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) and poly (9,9-dioctylfluorene-co-bis-N,N -(4-butylphenyl)-bis-N,N -phenyl-1,4 phenylenediamine) (PFB) have been employed to construct the heterojunction patterns. The laser-induced selective cross-linking of F8BT molecules and the subsequent rinsing process using the good solvent of chloroform for PFB supplies a stable template for a further metallization process. When colloidal gold nanoparticles were spin-coated onto the surface of the template, a majority of the gold nanoparticles were confined into the "holes" of originally PFB-rich phase, while a minor portion stays on the "ridges" of F8BT-rich phase. After the annealing process, larger gold nanoparticles were produced inside the holes and smaller ones on the ridges, which induced localized surface plasmon resonance in the near infrared and in the visible, respectively. The structural parameters of the gold plasmonic pattern can be tuned by different surface modification and annealing processes, which can tune the spectroscopic response in the spectral position and in the spectral intensity. The produced nanostructures with broadband plasmon resonance can be used as a template for random lasers with strong optical scattering at both the pump and emission wavelengths and for photovoltaic devices with strong absorption in the visible and near infrared.

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Pronounced Fano Resonance in Single Gold Split Nanodisks with 15 nm Split Gaps for Intensive Second Harmonic Generation

Cited by 142 publications

References 68 publications

Mode Coupling Properties of the Plasmonic Dimers Composed of Graphene Nanodisks

Mode Coupling Properties of the Plasmonic Dimers Composed of Graphene Nanodisks

Adhesion‐Engineering‐Enabled “Sketch and Peel” Lithography for Aluminum Plasmonic Nanogaps

Broadband Dual-Phase Plasmons through Metallization of Polymeric Heterojunctions

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