Electrochemical control of strong coupling states between localized surface plasmons and molecule excitons for Raman enhancement

Minamimoto, Hiro; Kato, Fumiya; Nagasawa, Fumika; Takase, Mai; Murakoshi, Kei

doi:10.1039/c7fd00126f

Cited by 13 publications

(17 citation statements)

References 29 publications

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“…[81] Based on this, we have attempted to tune the energy of the strong coupling state using Au nanostructures and dye molecules. [82] As ar esult, at the negative potential region, the splitting energy shifteds lightly from 0.22 to 0.26 eV,0 .23, and 0.19 eV,c orresponding to ap otential scan from 0V (vs. Ag/ AgCl) to À0.6, À0.7, and À0.8 V ( Figure 8a). The increased splitting energy derives from the plasmon energy change, leadingt ot he optimization of the strong couplings tate.…”

Section: Sers Observationo Ft He Strong Coupling Statementioning

confidence: 81%

Section: Effective Light Energysqueezingmentioning

confidence: 99%

Section: Effective Light Energysqueezingmentioning

confidence: 99%

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Plasmonic Fields Focused to Molecular Size

Minamimoto

Oikawa

et al. 2017

ChemNanoMat

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Efficient use of light energy is regarded as a key factor in solving energy challenges to create a sustainable society. The highly concentrated photon energy generated by localized surface plasmon resonance excitation in the vicinity of metal nanostructures can enhance light‐matter interaction. Optimization of the interactions between plasmons and electrons in materials can lead to novel light energy applications. To overcome the current limitations for these interactions, the plasmon field must be focused to an extremely small size close to the molecular scale. Formation of the plasmonic field at the quantum limit may cause interesting phenomena with unique photoresponses. Recently, following the development of nanofabrication techniques, detailed investigations have been undertaken to understand these processes. In this focus review, we describe recent advances in the strong interactions between highly localized photons and electrons in nanomaterials, including molecules, nanocarbons, and quantized nanoparticles. First, we outline the plasmonic properties that depend on the metal nanostructures. In addition, we describe surface‐enhanced Raman scattering (SERS), which is used to detect interactions between plasmons and materials. The importance of the resonant electronic excitation process, which is a chemical effect based on the charge transfer contribution, is discussed while considering the unique molecular selectivity in SERS. We then highlight the unique photoresponse properties that are used for ultra‐sensitive detection of single molecules by the localized plasmon field. These properties are major advantages of the plasmon field. Next, we introduce strong coupling between plasmons and excitons. This coupling state is promising because of its ability to modify the intrinsic optical properties of materials via creation of a novel absorption wavelength region to accumulate the light energy. Finally, we discuss the use of plasmon excitation for effective chemical reactions accompanied by electron transfer. We conclude that reduction of light to the molecular scale would open novel routes for energy manipulation required by the next generation.

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Section: Sers Observationo Ft He Strong Coupling Statementioning

confidence: 81%

Section: Effective Light Energysqueezingmentioning

confidence: 99%

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Plasmonic Fields Focused to Molecular Size

Minamimoto

Oikawa

et al. 2017

ChemNanoMat

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“…Although the potential scan to positive potentials also causes the decrease in the splitting energy, the origin has not been clarified yet. [ 35,36 ] Although the changes in the electron density of metal nanostructures result in the plasmon resonance wavelength shift, expected red shift less than 50 nm in the peak wavelength from −0.4 to 0.3 V is not enough to explain the observed decrease in the splitting energy by 0.046 eV (Figure 1d). Thus, to clarify the origin of the change in the splitting energy, further detailed electrochemical SERS measurements have been performed.…”

Section: Resultsmentioning

confidence: 99%

Surface‐enhanced Raman scattering probe for molecules strongly coupled with localized surface plasmon under electrochemical potential control

Minamimoto

Kato

Murakoshi

2020

J Raman Spectroscopy

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The light–matter interaction is the crucial tool for the efficient light energy usage. Electrochemical potential control method can tune the coupling strength between the molecules and the light field. In this study, electrochemical surface‐enhanced Raman scattering measurements have been carried out to clarify the detailed molecular behavior in the strong coupling regime. The Raman and fluorescence intensities from dye molecules in the strong coupling regime provided us the information about the change in the distance between the molecules and the metal surface in angstrom level. The detailed investigation of spectra revealed the origin for the potential dependence on the coupling strength. The present insight obtained in the current study would be valuable to understand the electrochemically controlled molecule–light interaction for photochemistry research.

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“…Minamimoto et al . recently experimentally investigated electrochemical controlled strong coupling effects between molecule excitons and LSPR.…”

Section: Strong Coupling Practical Applicationsmentioning

confidence: 99%

Strong Coupling in Microcavity Structures: Principle, Design, and Practical Application

Yua

et al. 2018

Laser & Photonics Reviews

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When interaction between light and matter is in the strong coupling region, matter has a significant influence on the whole system, with potential to develop low-power active optical devices. Strong coupling can verify some basic problems of quantum physics, and it is an ideal system to study light-matter interaction, providing an intuitive and accurate demonstration of some pure quantum effects with small mass and easy optical control. Here, the most important advances in strong coupling in recent years are described. Of late, an extensive series of experimental and theoretical findings, and remarkable achievements have been made in this field. Strong coupling between cavities and some new materials such as semiconductors, two-dimensional (2D) material, and quantum dots (QDs) are the focus of research in this field. Another field that has made outstanding progress is the application of this optical phenomenon, including resonance-enhanced Raman and infrared spectra, nanolasers, and cavity-enhanced sensing. Furthermore, the potential in this field arises for future quantum information and quantum optical devices. It is now developing at a very fast rate and can be predicted to have broad prospects for development in the future. Some prospects in terms of design and application are included.

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Electrochemical control of strong coupling states between localized surface plasmons and molecule excitons for Raman enhancement

Cited by 13 publications

References 29 publications

Plasmonic Fields Focused to Molecular Size

Plasmonic Fields Focused to Molecular Size

Surface‐enhanced Raman scattering probe for molecules strongly coupled with localized surface plasmon under electrochemical potential control

Strong Coupling in Microcavity Structures: Principle, Design, and Practical Application

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