Propagating and Localized Surface Plasmon Co-Enhanced Raman Scattering Based on a Waveguide Coupling Surface Plasmon Resonance Structure

Wang, Lehua; Geng, Yijia; Zhang, Shida; Liang, Jinsong; Xu, Shuping; Liu, Yu

doi:10.1021/acs.jpcc.2c07801

Cited by 6 publications

(11 citation statements)

References 29 publications

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“…One can expect that excitation of the Raman spectra within the absorption band related to NPs forming the hot spots will result in a high efficiency of the SERS spectra. It should be noted that an efficient SERS substrate does not necessarily exhibit sharp peaks due to plasmonic resonance, but a gradient (spectral) distribution of multiple localized resonances 78 or coupling/additive effect of localized plasmon and polariton 79 can be advantageous for high SERS intensity.…”

Section: Resultsmentioning

confidence: 99%

Self-Organized SERS Substrates with Efficient Analyte Enrichment in the Hot Spots

Dzhagan,

Mazur,

Kapush

et al. 2024

ACS Omega

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One of the requirements of an efficient surface-enhanced Raman spectroscopy (SERS) substrate is a developed surface morphology with a high density of "hot spots", nm-scale spacings between plasmonic nanoparticles. Of particular interest are plasmonic architectures that could enable self-localization (enrichment) of the analyte in the hot spots. We report a straightforward method of fabrication of efficient SERS substrates that comply with these requirements. The basis of the substrate is a large-area film of tightly packed SiO 2 spheres formed by their quick self-assembling upon drop casting from the solution. Thermally evaporated thin Ag layer is converted by quick thermal annealing into nanoparticles (NPs) selfassembled in the trenches between the silica spheres, i.e., in the places where the analyte molecules get localized upon deposition from solution and drying. Therefore, the obtained substrate morphology enables an efficient enrichment of the analyte in the hot spots formed by the densely arranged plasmonic NPs. The high efficiency of the developed SERS substrates is demonstrated by the detection of Rhodamine 6G down to 10 −13 mol/L with an enhancement factor of ∼10 8 , as well as the detection of low concentrations of various nonresonant analytes, both small dye molecules and large biomolecules. The developed approach to SERS substrates is very straightforward for implementation and can be further extended to using gold or other plasmonic NPs.

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Section: Resultsmentioning

confidence: 99%

Self-Organized SERS Substrates with Efficient Analyte Enrichment in the Hot Spots

Dzhagan,

Mazur,

Kapush

et al. 2024

ACS Omega

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“…The reaction was maintained for an hour. The silver colloid was prepared using Lee’s method, with an average nanoparticle diameter of about 60 nm …”

Section: Experimental Methodsmentioning

confidence: 99%

“…Surface plasmon resonance (SPR) is an important part of the SERS electromagnetic enhancement mechanism. , It can significantly increase the electric field intensity of incident light near the SPR resonance angle, resulting in an enhanced SERS signal. − SERS substrates based on SPR structures only require vapor-depositing one or several layers of dielectric film and are easy to manufacture and prepare in a large area. There are four types of SPR structures: traditional SPR, , long-range SPR, − CWSPs, , and WCSPR structures. , All four types of structures can be used for enhancing Raman scattering.…”

Section: Introductionmentioning

confidence: 99%

Surface Plasmon Field-Enhanced Raman Scattering Co-Excited by P-Polarized and S-Polarized Light Based on Waveguide-Coupled Surface Plasmon Resonance Configuration

Liu,

Liang,

et al. 2023

ACS Omega

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We constructed a waveguide-coupled surface plasmon resonance (WCSPR) structure to enhance Raman scattering. In this structure, P-polarized and S-polarized incident lasers can simultaneously coexcite the evanescent field, thereby further enhancing Raman scattering. This configuration is a five-phase Kretschmann resonance setup that consists of a SF10 prism/inner Ag film/SiO 2 film/outer Ag film/water structure. The WCSPR configuration effectively concentrates and confines the evanescent field excited by the incident light. Ag nanoparticles assembled on the outer Ag film surface enhance the evanescent field further by means of surface plasmon resonance. By finely tuning the thickness of the Ag and SiO 2 films, it is possible to achieve a coincidence between the SPR angle of P-polarized light and that of Spolarized light. At this angle, both P-and S-polarized light can jointly elevate the evanescent field intensity, leading to the simultaneous enhancement of the electric fields at the upper, lower, left, and right parts of the silver nanoparticles and generating maximum evanescent field enhancement. We achieved an electric field enhancement of up to 10 3 around the nanoparticles, leading to more SERS hotspots and comparable SERS enhancement capability to gap-type hotspots. Our WCSPR structure combined with the nanoparticles offers a feasible strategy for the SERS detection of large molecules that cannot be placed in traditional gap-type hotspots. It is highly convenient for SERS detection of large molecules.

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“…The most effective coupling of the LSPs and PSPs resulted in a great enhancement in the Raman signal relative to that obtained with a conventional SPR structure. 10 The Raman signals enhanced by this method are scattered in all directions, making them difficult to collect. We can apply the WCSPR structure and nanoparticles to the study of directionally emitted Raman scattering, thereby improving both the excitation efficiency and collection efficiency of Raman signals.…”

Section: Introductionmentioning

confidence: 99%

“…Surface-enhanced Raman scattering (SERS) serves as a powerful technique for direct multiplex analysis in complex systems and is currently one of the few spectroscopic techniques capable of single molecule detection. − According to the enhancement mechanism of SERS, the significantly amplified electric field that generated by metal nanostructures contributes predominantly to SERS. − This electromagnetic field enhancement can amplify the Raman signal by approximately 10 9 –10 10 , considerably increasing SERS signals. − However, the electric field surrounding nanostructures is uneven, and the enhanced SERS signals disperse freely in space, resulting in a low collection efficiency …”

Section: Introductionmentioning

confidence: 99%

Surface Plasmon-Coupled Directional Emission Enhanced Raman Scattering Based on Waveguide Coupling Surface Plasmon Resonance Configuration

Liu,

Liang,

et al. 2024

J. Phys. Chem. C

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In this paper, we introduce a method called waveguide coupling surface plasmon-coupled directional emission Raman (WCSPCR), which utilizes a bimetallic waveguide-coupled surface plasmon resonance structure (WCSPR) to enhance the directional emission Raman spectrum by utilizing excited surface plasmons in the evanescent field. We further enhance Raman scattering by utilizing localized and propagating surface plasmons. The further enhanced Raman scattering was directionally emitted due to the resonance effect of the propagating surface plasmons in the WCSPR structure. We obtained angle-dependent directional emission Raman scattering spectra using an in-house angle-dependent SPR-SERS microspectrometer. Compared to a traditional SPR structure, the WCSPR structure showed a superior electromagnetic field and a narrower emission angle. This led to an eight-fold increase in the directional emission Raman signal and a narrower full width at half-maximum of the directional emission angle under the WCSPR configuration. This could further improve the directional emission of Raman signals and enhance the collection efficiency of Raman signals. To further enhance the directional emission Raman signal, we incorporated silver nanoparticles (AgNps) into the WCSPR configuration, creating a WCSPR/4-Mpy/AgNps sandwich structure. Under this configuration, localized and propagating surface plasmons are effectively coupled, resulting in a significant enhancement of the directional emission Raman signal for 4-mercaptopyridine. The combination of local and propagating surface plasmons further amplified the AgNp-assisted SERS signal in the WCSPR/4-Mpy/AgNps sandwich structure, the amplified SERS signal was directionally emitted due to the interaction with the propagating surface plasmons, yielding a signal strength 30 times that of the traditional SPR structure. These findings are consistent with electric field simulations. The WCSPCR method shows promise in enhancing SERS signals, simplifying SERS instruments, and may have applications in biochemical testing.

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Propagating and Localized Surface Plasmon Co-Enhanced Raman Scattering Based on a Waveguide Coupling Surface Plasmon Resonance Structure

Cited by 6 publications

References 29 publications

Self-Organized SERS Substrates with Efficient Analyte Enrichment in the Hot Spots

Self-Organized SERS Substrates with Efficient Analyte Enrichment in the Hot Spots

Surface Plasmon Field-Enhanced Raman Scattering Co-Excited by P-Polarized and S-Polarized Light Based on Waveguide-Coupled Surface Plasmon Resonance Configuration

Surface Plasmon-Coupled Directional Emission Enhanced Raman Scattering Based on Waveguide Coupling Surface Plasmon Resonance Configuration

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