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

Liu, Yu; Liang, Jingqiu; Xu, Shuping; Geng, Yijia

doi:10.1021/acsomega.3c06740

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…In our previous studies, we proposed a waveguide-coupled surface plasmon resonance (WCSPR) configuration to enhance Raman signals. 44 By adding nanoparticles to the WCSPR structure, the coupling of PSPs and LSPs can collectively enhance Raman scattering. 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.…”

Section: Introductionmentioning

confidence: 99%

“…However, these studies lacked coupling between PSPs and LSPs, resulting in a poor electric field enhancement effect and limited enhancement of SERS signals. In our previous studies, we proposed a waveguide-coupled surface plasmon resonance (WCSPR) configuration to enhance Raman signals . By adding nanoparticles to the WCSPR structure, the coupling of PSPs and LSPs can collectively enhance Raman scattering.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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Polarized and Evanescent Guided Wave Surface-Enhanced Raman Spectroscopy of Ligand Interactions on a Plasmonic Nanoparticle Optical Chemical Bench

Chen,

Andrews

2024

Biosensors

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This study examined applications of polarized evanescent guided wave surface-enhanced Raman spectroscopy to determine the binding and orientation of small molecules and ligand-modified nanoparticles, and the relevance of this technique to lab-on-a-chip, surface plasmon polariton and other types of field enhancement techniques relevant to Raman biosensing. A simplified tutorial on guided-wave Raman spectroscopy is provided that introduces the notion of plasmonic nanoparticle field enhancements to magnify the otherwise weak TE- and TM-polarized evanescent fields for Raman scattering on a simple plasmonic nanoparticle slab waveguide substrate. The waveguide construct is called an optical chemical bench (OCB) to emphasize its adaptability to different kinds of surface chemistries that can be envisaged to prepare optical biosensors. The OCB forms a complete spectroscopy platform when integrated into a custom-built Raman spectrograph. Plasmonic enhancement of the evanescent field is achieved by attaching porous carpets of Au@Ag core shell nanoparticles to the surface of a multi-mode glass waveguide substrate. We calibrated the OCB by establishing the dependence of SER spectra of adsorbed 4-mercaptopyridine and 4-aminobenzoic acid on the TE/TM polarization state of the evanescent field. We contrasted the OCB construct with more elaborate photonic chip devices that also benefit from enhanced evanescent fields, but without the use of plasmonics. We assemble hierarchies of matter to show that the OCB can resolve the binding of Fe2+ ions from water at the nanoscale interface of the OCB by following the changes in the SER spectra of 4MPy as it coordinates the cation. A brief introduction to magnetoplasmonics sets the stage for a study that resolves the 4ABA ligand interface between guest magnetite nanoparticles adsorbed onto host plasmonic Au@Ag nanoparticles bound to the OCB. In some cases, the evanescent wave TM polarization was strongly attenuated, most likely due to damping by inertial charge carriers that favor optical loss for this polarization state in the presence of dense assemblies of plasmonic nanoparticles. The OCB offers an approach that provides vibrational and orientational information for (bio)sensing at interfaces that may supplement the information content of evanescent wave methods that rely on perturbations in the refractive index in the region of the evanescent wave.

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

Cited by 2 publications

References 35 publications

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

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

Polarized and Evanescent Guided Wave Surface-Enhanced Raman Spectroscopy of Ligand Interactions on a Plasmonic Nanoparticle Optical Chemical Bench

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