Free-standing Ag triangle arrays a configurable vertical gap for surface enhanced Raman spectroscopy

Li, Kuanguo; Wang, Yong; Jiang, Kang; Ren, Yuan; Dai, Yanqiu; Lu, Yonghua; Wang, Pei

doi:10.1088/1361-6528/aa7a4d

Cited by 14 publications

(5 citation statements)

References 35 publications

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“…This optimized design geometry is consistent with the common notion that nano-gaps strongly localize the electromagnetic field [8][9][10][11] , due to excitation of a localized plasmonic resonance combined with the corner singularity in the electric field near sharp tips [14][15][16] , a phenomenon which appears instrumental to large Raman enhancement. Scanning electron microscopy (SEM) images in Fig.…”

Section: Introductionsupporting

confidence: 82%

“…Surface-enhanced Raman scattering (SERS) capitalizes on the local electromagnetic field enhancement near plasmonic metal nanostructures [4][5][6][7][8][9][10][11] to dramatically boost Raman scattering from molecules, enabling detection sensitivity down to the single molecule level 8,11,[14][15][16] . However, such gaint enhancement is only found in structures with extremely fine feature size not compatible with standard lithographic fabrication.…”

Section: Introductionmentioning

confidence: 99%

“…where ISERS, I0 are the intensities of the 604 cm -1 Raman peak measured on the SERS substrate and reference, respectively, and CSERS and C0 are the concentrations of R6G in the aqueous solution that the SERS and reference substrates were treated with 14,42 . Using the formula, we obtained an average SERS EF of 5±0.3 × 10 4 for the 604 cm -1 Raman peak.…”

Section: Introductionmentioning

confidence: 99%

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Topology optimization of surface-enhanced Raman scattering substrates

Pan

Christiansen

Michon

et al. 2021

Applied Physics Letters

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Surface-enhanced Raman spectroscopy is a powerful and versatile sensing method with a detection limit down to the single molecule level. In this article, we demonstrate how topology optimization (TopOpt) can be used for designing surface enhanced Raman scattering (SERS) substrates adhering to realistic fabrication constraints. As an example, we experimentally demonstrated a SERS enhancement factor of 5 × 10 4 for the 604 cm -1 Raman line of rhodamine 6G using metal nanostructures with a critical dimension of 20 nm. We then show that, by relaxing the fabrication constraints, TopOpt may be used to design SERS substrates with orders of magnitude larger enhancement factor. The results validate topology optimization as an effective method for engineering nanostructures with optimal performance and fabrication tolerance.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Topology optimization of surface-enhanced Raman scattering substrates

Pan

Christiansen

Michon

et al. 2021

Applied Physics Letters

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“…Anisotropic-shaped plasmonic materials are highly desirable for optoelectronic device, sensing, single-molecule detection, and surface-enhanced Raman spectroscopy (SERS) as they can show multiple plasmon modes and high electric field enhancement at the tips and well-faceted edges. − The LSPR peaks are found to be red-shifted with increase in size of nanotriangle or nanorod. , Bimodal plasmon can be achieved in nanorod morphology for longitudinal and transverse plasmon modes. High plasmon sensitivity has also been achieved for the two modes of nanorods.…”

Section: Introductionmentioning

confidence: 99%

Cation Exchange Mediated Synthesis and Tuning of Bimodal Plasmon in Alloyed Ternary Cu₃BiS_3–xSe_x Nanorods

et al. 2018

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We report a robust methodology for synthesizing monodisperse alloyed Bi 2 S 3−x Se x nanorods (NRs) to tune optical properties with the variation of Se concentration. The intercalation of Cu(I) into the presynthetic Bi 2 S 3−x Se x NRs converted to ternary Cu 3 BiS 3−x Se x NRs via cation exchange process. The transformation was monitored through the formation of core/shell Bi 2 S 3−x Se x / Cu 3 BiS 3−x Se x nanorod heterostructures. Shape anisotropy results in near-infrared bimodal localized surface plasmon resonance (LSPR) in Cu 3 BiS 3−x Se x nanorod over a broad range from 600 to 3500 nm with increase of Se:S ratio. The LSPR sensitivity, defined as the change in the LSPR peak wavelength per unit change in the refractive index (RI) of the medium, was estimated to be 250−350 nm/RI unit, much higher than other copper chalcogenides like Cu 2 S/Cu 2 Se. A fast photodetector was fabricated by Cu 3 BiS 3−x Se x NRs with high photocurrent gain value (∼125) with Se alloying. The intrinsic Cu vacancies and the effective mass of charge carriers play important roles to manipulate optical and electrical properties of Cu 3 BiS 3−x Se x NRs.

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“…In recent years, the SERS technology with the triangular substrate has been applied in some fields. For example, a large-scale vertical coupling structure based on Ag triangular array was prepared by nanospheres lithography incorporated with photolithography and film layer control technology, different choices were provided for SERS application [24,25]. Wang et al used a novel mono-metallic epitaxial strategy to synthesize triangular hollow gold microplates, and then gold particles are used to modify the outer surface to obtain stronger Raman enhancement.…”

Section: Introductionmentioning

confidence: 99%

The performance of surface enhanced Raman scattering and spatial resolution with triangular plate dimer from ultra-ultraviolet to near-infrared range

Wei¹,

Pei²,

Yan³

et al. 2021

J. Phys.: Condens. Matter

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The theoretical research on surface enhanced Raman spectroscopy (SERS) of triangular plate dimer (TPD) is of great significance for the design of experimental substrates. In this paper, the SERS properties of the TPD with Au, Ag, Al and Cu have been theoretical investigated in the ultra-ultraviolet, visible and near-infrared region. The influence of the TPD configuration, including the tip radian, the dimer distance and the aspect ratio on the electric field, Raman enhancement and spatial resolution are studied by the finite element method. The results show that there are dipole resonance band and quadruple dipole resonance band in the surface plasmon resonance band of TPD. The tip radian and dimer distance play the dominant role in the electric field enhancement, and the aspect ratio can be mainly used to tune the peak position of the electric field. The smaller tip radian and dimer distance will produce a stronger localized electric field and a small red shift of the peak position. Adjusting the aspect ratio can tune the position of electric field peak from ultraviolet (UV) to near-infrared without changing the peak value of the electric field significantly, especially for Al TPD. The maximum Raman enhancement factor of Au, Ag and Cu all reach 11 orders of magnitude, and 9 orders of magnitude for Al. The spatial resolution changes linearly with the gap distance, and the maximum spatial distributions of Au, Ag, Al and Cu achieve 0.65 nm, 0.67 nm, 0.69 nm and 0.70 nm with the dimer distance of 1 nm. Our results not only provide a better theoretical guidance for the optimization of TPD substrates in the SERS experiment, but also extend its application scope from ultra-UV to near-infrared range.

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Free-standing Ag triangle arrays a configurable vertical gap for surface enhanced Raman spectroscopy

Cited by 14 publications

References 35 publications

Topology optimization of surface-enhanced Raman scattering substrates

Topology optimization of surface-enhanced Raman scattering substrates

Cation Exchange Mediated Synthesis and Tuning of Bimodal Plasmon in Alloyed Ternary Cu₃BiS_3–xSe_x Nanorods

The performance of surface enhanced Raman scattering and spatial resolution with triangular plate dimer from ultra-ultraviolet to near-infrared range

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Free-standing Ag triangle arrays a configurable vertical gap for surface enhanced Raman spectroscopy

Cited by 14 publications

References 35 publications

Topology optimization of surface-enhanced Raman scattering substrates

Topology optimization of surface-enhanced Raman scattering substrates

Cation Exchange Mediated Synthesis and Tuning of Bimodal Plasmon in Alloyed Ternary Cu3BiS3–xSex Nanorods

The performance of surface enhanced Raman scattering and spatial resolution with triangular plate dimer from ultra-ultraviolet to near-infrared range

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Cation Exchange Mediated Synthesis and Tuning of Bimodal Plasmon in Alloyed Ternary Cu₃BiS_3–xSe_x Nanorods