Single-site surface-enhanced Raman scattering beyond spectroscopy

Takase, Mai; Yasuda, Satoshi; Murakoshi, Kei

doi:10.1007/s11467-015-0490-0

Cited by 8 publications

(3 citation statements)

References 66 publications

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“…In our previous study, we selected a single‐walled carbon nanotube (SWCNT) as the target material . An isolated SWCNT was located in the gap of Au nanodimer structures and SERS measurements were conducted to study the electron excitation process (Figure ).…”

Section: Electronic Excitation By Lspr Fieldsmentioning

confidence: 99%

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: Electronic Excitation By Lspr Fieldsmentioning

confidence: 99%

Plasmonic Fields Focused to Molecular Size

Minamimoto

Oikawa

et al. 2017

ChemNanoMat

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“…For this plasmonic light enhancement to be performed, a variety of nanostructures can be used, such as (among others) plasmonic resonators [6][7][8][9], nanowire waveguides [10][11][12], nanoantenas [13], nanorods [14] and plasmonic-photonic hybrid cavities [15]; the employment of metallic plasmonic nanogaps in the vicinity of particle dimers [16][17][18] is also an archetypal example. Indeed, surface-enhanced molecular spectroscopy has paved the way for exploring novel nonlinear effects and tailoring light-matter interaction scenarios [19].…”

Section: Introductionmentioning

confidence: 99%

Probing intensity-field correlations of single-molecule surface-enhanced Raman-scattered light

Santos-Sánchez

2019

Front. Phys.

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In the context of the quantum-mechanical description of single-molecule surface-enhanced Raman scattering, intensity-field correlation measurements of photons emitted from a plasmonic cavity are explored, theoretically, using the technique of conditional homodyne detection. The inelastic interplay between plasmons and vibrations of a diatomic molecule placed inside the cavity can be manifested in phase-dependent third-order fluctuations of the light recorded by the aforesaid technique, allowing us to reveal signatures of non-classicality (indicatives of squeezing) of the outgoing Raman photons.

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“…In general, both SERRS and SEF are crucially dependent on the nano-substrate. The most commonly used substrates are noble metal NPs, such as Ag and Au, because of their excellent LSPR activity and relatively simple preparation process 17 – 19 . For the metallic dimer configuration, the EM enhancement ( M ) and scattering cross section are related to many factors, such as the material of the substrate, the size of the NPs, the separation between NPs, as well as the laser photon energy.…”

Section: Introductionmentioning

confidence: 99%

Density-matrix evaluation of the enhancement to resonant Raman scattering and fluorescence of molecules confined in metallic nanoparticle dimers

Wei

Sun

et al. 2018

Sci Rep

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In the present work we study the surface-enhanced resonant Raman scattering (SERRS) and fluorescence (SEF) spectra of a general model molecule confined in metallic dimers consisting of Ag, Au and hybrid AuAg nanoparticles (NPs). The electromagnetic (EM) enhancement factors were simulated by the generalized Mie scatting method and the scattering cross section of the molecules were obtained by density-matrix calculations. The influence of the size of the NPs and the separation between the dimer on the Raman scattering and fluorescence were systematically studied and analyzed in detail. It was found that the SERRS mainly related to EM enhancement and the SEF depended on the competition between EM enhancement and quantum yield, both of which could be controlled by tuning the radius and separation of the metallic dimers. The optimal radius of the NPs for SERRS were found to be around 30 nm for AgNPs, 40 nm for AuNPs and 50 nm for hybrid AuAgNPs. The strongest Raman enhancement as predicted by the theoretical simulations were 6.2 × 1010, 1.5 × 107 and 5.2 × 108 for the three types of structures, respectively. These results could offer valuable information for the design of metallic substrates for surface enhanced Raman and fluorescence measurements.

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Single-site surface-enhanced Raman scattering beyond spectroscopy

Cited by 8 publications

References 66 publications

Plasmonic Fields Focused to Molecular Size

Plasmonic Fields Focused to Molecular Size

Probing intensity-field correlations of single-molecule surface-enhanced Raman-scattered light

Density-matrix evaluation of the enhancement to resonant Raman scattering and fluorescence of molecules confined in metallic nanoparticle dimers

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