Surface plasmon mediated Raman scattering in metal nanoparticles

Bachelier, Guillaume; Mlayah, Adnen

doi:10.1103/physrevb.69.205408

Cited by 82 publications

(103 citation statements)

References 24 publications

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“…Using the resulting relationship ω 1,2 (cm −1 ) = 47/D(nm), one deduced an average diameter of 6.0 ± 0.4 nm for sample A from its spectrum reported in Fig. 2, in good agreement with TEM measurements (see Table I), but with a lower inhomogeneous broadening, probably due to selective plasmon-resonance effects [44].…”

Section: Size Effectsupporting

confidence: 72%

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Plasmon-resonant Raman spectroscopy in metallic nanoparticles: Surface-enhanced scattering by electronic excitations

et al. 2015

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Since the discovery of surface-enhanced Raman scattering (SERS) 40 years ago, the origin of the "background" that is systematically observed in SERS spectra has remained questionable. To deeply analyze this phenomenon, plasmon-resonant Raman scattering was recorded under specific experimental conditions on a panel of composite multilayer samples containing noble metal (Ag and Au) nanoparticles. Stokes, anti-Stokes, and wide, including very low, frequency ranges have been explored. The effects of temperature, size (in the nm range), embedding medium (SiO 2 , Si 3 N 4 , or TiO 2 ) or ligands have been successively analyzed. Both lattice (Lamb modes and bulk phonons) and electron (plasmon mode and electron-hole excitations) dynamics have been investigated. This work confirms that in Ag-based nanoplasmonics composite layers, only Raman scattering by single-particle electronic excitations accounts for the background. This latter appears as an intrinsic phenomenon independently of the presence of molecules on the metallic surface. Its spectral shape is well described by revisiting a model developed in the 1990s for analyzing electron scattering in dirty metals, and used later in superconductors. The g s factor, that determines the effective mean-free path of free carriers, is evaluated, g expt s = 0.33 ± 0.04, in good agreement with a recent evaluation based on time-dependent local density approximation g theor s = 0.32. Confinement and interface roughness effects at the nanometer range thus appear crucial to understand and control SERS enhancement and more generally plasmon-enhanced processes on metallic surfaces.

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Section: Size Effectsupporting

confidence: 72%

“…Indeed, this in situ signal originates from the total but only volume in which inelastic electronic scattering occurs. Both vibrational and electronic signals should suffer the same confinement and plasmon-resonant enhancement that critically depend on size distribution and excitation energy [44].…”

Section: Size Effectmentioning

confidence: 99%

Plasmon-resonant Raman spectroscopy in metallic nanoparticles: Surface-enhanced scattering by electronic excitations

et al. 2015

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“…It should be noted that all the E g and T 2g vibrations (as well as the A 1g vibrations) are Raman active but only the ones sharing a strong similarity with the S 2 modes are expected to contribute significantly to the Raman spectra due to the surface deformation scattering mechanism. 4 In order to confirm the validity of this simple approach for spherical nanoparticles, we use a method similar to the one used in a previous work. 17 Studying the frequency changes resulting from a continuous variation of the elasticity of the material the sphere is made of provides some insight into the nature of the vibrations.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4] This scattering is similar to surface enhanced Raman scattering from molecules close to such a metallic nanostructure 1 making it an interesting complementary way to study this complex phenomenon having many applications for very sensitive detection. The enhancement due to using laser excitations resonant with the dipolar plasmon in such nanostructures and the high quality samples available today are responsible for low-frequency Raman spectra having an unmatched number of features 5 compared to non-metallic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Simple model for the vibrations of embedded elastically cubic nanocrystals

et al. 2010

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The purpose of this work is to calculate the vibrational modes of an elastically anisotropic sphere embedded in an isotropic matrix. This has important application to understanding the spectra of low-frequency Raman scattering from nanoparticles embedded in a glass matrix. First some low frequency vibrational modes of a free cubically elastic sphere are found to be nearly independent of one combination of elastic constants. This is then exploited to obtain an isotropic approximation for these modes which enables to take into account the surrounding isotropic matrix. This method is then used to quantatively explain recent spectra of gold and copper nanocrystals in glasses.

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“…The optical properties of different nanoemitters and their arrays were actively investigated in recent years. Particularly, due to remarkable progress in the development of the metallic nanoparticles fabrication techniques [61,62] their ensembles are finding expanding applications as optical waveguides [63,64], surface enhanced Raman scattering medium [65,66], high quality optical resonators [67][68][69], antennas and detectors [70]. The various types of particles arrangements were considered for these purposes providing the possibility to adjust the resulting optical characteristics according to the medium geometry.…”

Section: Planar Array Of Oscillators Excited By Curved Incident mentioning

confidence: 99%

All-optical control of unipolar pulse generation in a resonant medium with nonlinear field coupling

et al. 2017

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We study optical response of a resonant medium possessing nonlinear coupling to external field driven by a few-cycle pump pulse sequence. We demonstrate the possibility to directly produce unipolar half-cycle pulses from the medium possessing an arbitrary nonlinearity, by choosing the proper pulse-to-pulse distance of the pump pulses in the sequence. We examine the various ways of the shaping of the medium response using different geometrical configurations of nonlinear oscillators and different wavefront shapes for the excitation pulse sequence. Our approach defines a general framework to produce unipolar pulses of controllable form.

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Surface plasmon mediated Raman scattering in metal nanoparticles

Cited by 82 publications

References 24 publications

Plasmon-resonant Raman spectroscopy in metallic nanoparticles: Surface-enhanced scattering by electronic excitations

Plasmon-resonant Raman spectroscopy in metallic nanoparticles: Surface-enhanced scattering by electronic excitations

Simple model for the vibrations of embedded elastically cubic nanocrystals

All-optical control of unipolar pulse generation in a resonant medium with nonlinear field coupling

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