Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

Chen, Yi-Chuan; Sun, Mengtao

doi:10.1039/d3nr01388j

Cited by 4 publications

(3 citation statements)

References 142 publications

(182 reference statements)

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“…Third, we measure plasmon-enhanced fluorescence to identify the influence on future experimental works for plasmon–exciton co-driven photocatalysis based on nanomodified g-C 3 N 4 nanostructures. As a kind of hybrid quasiparticles, the mutual coupling between plasmon and exciton on the surface of nanomodified g-C 3 N 4 nanostructures will lead to the formation of mixed excitation modes, which exhibit different physical characteristics from the plasmon and exciton themselves . Fourthly, we successfully observed the plasmon-enhanced pre-resonance Raman spectra of pristine g-C 3 N 4 , porous size-dependent g-C 3 N 4 , and the site-selected N vacancy of g-C 3 N 4 , which can identify and confirm the structures in Kong et al’s works and provide a way to identify future nanomodified g-C 3 N 4 nanostructures.…”

Section: Introductionsupporting

confidence: 77%

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C₃N₄ Nanostructures

Cao,

Sun,

et al. 2023

ACS Appl. Opt. Mater.

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We report an experimental investigation on the optical and physical properties of nanomodified two-dimensional g-C3N4 nanosheets, focusing on plasmon-enhanced resonance Raman scattering (PE-RRS). The nanomodifications on pristine g-C3N4 significantly decrease the fluorescence intensity and shorten the fluorescence lifetime. The plasmon–exciton coupling interactions are studied with fluorescence lifetime imaging and PE-RRS. The resonance Raman spectra of pristine g-C3N4 and nanomodified g-C3N4 are successfully observed. Our results provide an approach to measuring resonance Raman scattering spectra that are strongly interfered with by fluorescence backgrounds.

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Section: Introductionsupporting

confidence: 77%

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C₃N₄ Nanostructures

Cao,

Sun,

et al. 2023

ACS Appl. Opt. Mater.

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“…Plasmon nanoantennas have attracted considerable research interest owing the unique capability to enhance and confine the optical field at the nanoscale [1,2]. Localized surface plasmon resonance (LSPR) phenomenon will occur when the frequency of the incident light is consistent with the natural frequency oscillation of the electrons on the metallic nanoantenna surface, resulting in the enormous electric field [3][4][5]. Nanoantenna structures supporting LSPR offer a way to break the optical diffraction limit by concentrating light into subwavelengths [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Surface-enhanced photoluminescence and Raman spectroscopy of single molecule confined in coupled Au bowtie nanoantenna

Pei,

Peng,

Zhang

et al. 2024

Nanotechnology

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Optical nanoantennas possess broad applications in the fields of photodetection, environmental science, biosensing and nonlinear optics, owing to their remarkable ability to enhance and confine the optical field at the nanoscale. In this article, we present a theoretical investigation of surface-enhanced photoluminescence spectroscopy for single molecules confined within novel Au bowtie nanoantenna, covering a wavelength range from the visible to near-infrared spectral regions. We employ the finite element method to quantitatively study the optical enhancement properties of the plasmonic field, quantum yield, Raman scattering and fluorescence. Additionally, we systematically examine the contribution of nonlocal dielectric response in the gap mode to the quantum yield, aiming to gain a better understanding of the fluorescence enhancement mechanism. Our results demonstrate that altering the configuration of the nanoantenna has a significant impact on plasmonic sensitivity. The nonlocal dielectric response plays a crucial role in reducing the quantum yield and corresponding fluorescence intensity when the gap distance is less than 3 nm. However, a substantial excitation field can effectively overcome fluorescence quenching and enhance the fluorescence intensity. By optimizing nanoantenna configuration, the maximum enhancement of surface-enhanced Raman can be turned to 9 and 10 magnitude orders in the visible and near-infrared regions, and 3 and 4 magnitude orders for fluorescence enhancement, respectively. The maximum spatial resolutions of 0.8 nm and 1.5 nm for Raman and fluorescence are also achieved, respectively. Our calculated results not only provide theoretical guidance for the design and application of new nanoantennas, but also contribute to expanding the range of surface-enhanced Raman and fluorescence technology from the visible to the near-infrared region.

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“…Colloidal plexcitonic materials (CPMs) are a class of nanosystems produced by the strong coupling between NPs and molecules [ 17 ], in which the components of NPs provide a powerful platform to strongly localize the electric field and exchange energy with excitons, resulting in the Rabi splitting and the formation of half-light–half-matter hybrid states when the rate of energy exchange exceeds the dissipation of the system [ 18 , 19 , 20 , 21 ]. In a Surface-Enhanced Circular Dichroism (SECD) nanosystem, NPs can be applied to enhance the CD spectra of chiral molecules because of their strong localized electric field.…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Manipulating Chirality and Chiral Sensing Based on Chiral Plexcitons in a Strong-Coupling Regime

Liang,

Deng

et al. 2024

Nanomaterials

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Manipulating plasmonic chirality has shown promising applications in nanophotonics, stereochemistry, chirality sensing, and biomedicine. However, to reconfigure plasmonic chirality, the strategy of constructing chiral plasmonic systems with a tunable morphology is cumbersome and complicated to apply for integrated devices. Here, we present a simple and effective method that can also manipulate chirality and control chiral light–matter interactions only via strong coupling between chiral plasmonic nanoparticles and excitons. This paper presents a chiral plexcitonic system consisting of L-shaped nanorod dimers and achiral molecule excitons. The circular dichroism (CD) spectra in our strong-coupling system can be calculated by finite element method simulations. We found that the formation of the chiral plexcitons can significantly modulate the CD spectra, including the appearance of new hybridized peaks, double Rabi splitting, and bisignate anti-crossing behaviors. This phenomenon can be explained by our extended coupled-mode theory. Moreover, we explored the applications of this method in enantiomer ratio sensing by using the properties of the CD spectra. We found a strong linear dependence of the CD spectra on the enantiomer ratio. Our work provides a facile and efficient method to modulate the chirality of nanosystems, deepens our understanding of chiral plexcitons in nanosystems, and facilitates the development of chiral devices and chiral sensing.

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Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

Abstract: Plexcitonics is a rapidly developing interdisciplinary field that holds immense potential for the creation of innovative optical technologies and devices. This field focuses on investigating the interactions between plasmons and...

Cited by 4 publications

References 142 publications

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C₃N₄ Nanostructures

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C₃N₄ Nanostructures

Surface-enhanced photoluminescence and Raman spectroscopy of single molecule confined in coupled Au bowtie nanoantenna

The Mechanism of Manipulating Chirality and Chiral Sensing Based on Chiral Plexcitons in a Strong-Coupling Regime

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Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

Abstract: Plexcitonics is a rapidly developing interdisciplinary field that holds immense potential for the creation of innovative optical technologies and devices. This field focuses on investigating the interactions between plasmons and...

Cited by 4 publications

References 142 publications

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C3N4 Nanostructures

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C3N4 Nanostructures

Surface-enhanced photoluminescence and Raman spectroscopy of single molecule confined in coupled Au bowtie nanoantenna

The Mechanism of Manipulating Chirality and Chiral Sensing Based on Chiral Plexcitons in a Strong-Coupling Regime

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Product

Resources

About

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C₃N₄ Nanostructures

Plasmon-Enhanced Resonance Raman Scattering and Fluorescence of Nanomodified g-C₃N₄ Nanostructures