Scattering and absorption by spherical multilayer particles

Sinzig, J.; Quinten, Michael

doi:10.1007/bf00332172

Cited by 92 publications

(60 citation statements)

References 7 publications

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“…18 Optical measurements on ensembles of Ag-Au shell-core colloids in solution also revealed two extinction peaks, indicating independent plasmon excitations in shell and core of the particles. 12,13,16 As in the present work, the Au shell-Ag core particles showed less defined optical extinction spectra compared to the opposite configuration, which again suggests enhanced diffusion of Ag atoms towards the cluster surface. Taking these arguments into consideration, an enrichment of Ag atoms in the Au shell provides a plausible explanation for the reduced wavelength difference between shell and core plasmon peaks observed in this experiment.…”

Section: Optical Properties Of Ag-au Shell-core Clusterssupporting

confidence: 69%

“…10 A strong dependence of the plasmon energy on the composition has earlier been observed for ensembles of Ag-Au alloy clusters embedded in photosensitive glass. 12,13 The extinction spectra were also characterized by a single resonance, which monotonously shifted from the Au ͑510 nm͒ to the Ag ͑405 nm͒ position with increasing Ag fraction. Our results on single clusters are in line with this observation, emphasizing that STM-induced light emission is not dominated by the properties of the tip-sample cavity, but reflects the properties of the alloy particle in the tunneling contact.…”

Section: B Optical Properties Of Ag-au Alloy Clustersmentioning

confidence: 99%

“…Mie-plasmon excitations in pure Ag and Au particles are well separated in energy, but converge with an increasing alloying of both materials. [11][12][13] The analysis of Mie plasmons in mixed Ag-Au particles is therefore a sensitive means to characterize the alloying process.…”

Section: Introductionmentioning

confidence: 99%

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Photon Emission Spectroscopy of Single Oxide-Supported Ag-Au Alloy Clusters

Benten¹,

Nilius²,

Ernst³

et al. 2005

Phys. Rev. B

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The alloying of Ag and Au has been investigated on the level of individual clusters by analyzing the light emission excited by electron injection from an STM tip. Different Ag-Au alloy and shell-core clusters have been prepared at room temperature on a thin Al 2 O 3 film on NiAl͑110͒ by simultaneous and successive deposition of both noble metals. For simultaneous deposition, one Mie-plasmon resonance has been detected with a wavelength position shifting from the pure Au to the Ag value with increasing Ag content. The results are in agreement with calculations based on Mie theory indicating a complete mixing of both materials. For successive deposition, two Mie resonances have been observed, attributed to plasmon excitations in the shell and core of the clusters. Comparing these results to model calculations, a considerable intermixing of the core and shell materials is concluded, which is especially strong in Au shell-Ag core clusters.

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Section: Optical Properties Of Ag-au Shell-core Clusterssupporting

confidence: 69%

Section: B Optical Properties Of Ag-au Alloy Clustersmentioning

confidence: 99%

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Photon Emission Spectroscopy of Single Oxide-Supported Ag-Au Alloy Clusters

Benten¹,

Nilius²,

Ernst³

et al. 2005

Phys. Rev. B

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“…The coating effect has been investigated in several works [17,18]. By taking into account the boundary conditions at the different spherical boundaries, i.e.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…These depend sensitively on the thickness d and refractive index n 2 of the coating, but can be calculated straightforwardly using equations given by, e.g. Sinzig and Quinten [18]. The redefined scattering coefficients can then be used as in standard Mie theory, e.g.…”

Section: Theoretical Modelmentioning

confidence: 99%

Modeling the optical response of nanoparticle-based surface plasmon resonance sensors

Käll

2002

Sensors and Actuators B: Chemical

172

114

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We model the optical response of surface plasmon resonance (SPR) sensors based on colloidal metal nanoparticles using extended Mie theory. The theoretical description includes the particle adsorption layer, the surrounding medium as well as particle-particle and particlesubstrate electromagnetic coupling effects. We obtain quantitative agreement with recently reported experimental results on gold nanoparticle SPR sensors, indicating the possibility to perform accurate a priori estimates of detector sensitivity for different particle sizes and compositions in a variety of electromagnetic environments. The possibility to increase sensitivity by using non-spherical silver particles as SPR sensors is discussed. #

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Interpretation of IR Spectra of Ultrathin Films

2003

Handbook of Infrared Spectroscopy of Ultrathin Films

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Generally speaking, IR spectral measurements of ultrathin films are undertaken to determine (i) the chemical identity of adsorbed species (including dissociation fragments); (ii) the geometric or structural arrangement (orientation) of these species and their positions with respect to the surface atoms of the substrate; (iii) their vibrational, rotational, and translational motion on the surface; (iv) the charge distribution and energy level structure of the valence electrons in both adsorbate and substrate; and (v) the effects of external perturbations, such as the electric and magnetic fields, photons, electrons, heating, and surface pressure on factors (i)-(iv) [1]. However, such information cannot be extracted directly from the IR spectra of ultrathin films due to the strong dependence of the shape and relative intensity of the bands on the geometry of the experiment, the optical properties of the substrate, the surroundings, the gradient of the optical properties at the film-substrate interface and in the film itself, as well as on the film thickness, and the particle size in the case of powder or islandlike supports. These effects and their physical background are discussed in Sections 3.1-3.5 and 3.9. In addition, there can be an intensity transfer between modes of coadsorbed species and a change in the band position with surface coverage. This effect is used for determining the mode of the surface filling and the degree of intermixing of different species at the surface (Section 3.6). If the film under study is located at the electrode-solution interface, the resulting spectrum is made up of contributions of all species in the path of radiation that are affected by the electrode potential, which further complicates the interpretation. Apart from technical means (Chapter 4), there exist analytical and mathematical approaches to resolve contributions of different species in such a complex spectrum (Sections 3.7 and 3.8). Another feature of the IR spectra of ultrathin films that is perhaps surprising and unexpected is their sensitivity to the volume fraction, shape, and orientation of inhomogeneities (e.g., pores or inclusions) in the film. Moreover, if the characteristic size of the 140

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Scattering and absorption by spherical multilayer particles

Cited by 92 publications

References 7 publications

Photon Emission Spectroscopy of Single Oxide-Supported Ag-Au Alloy Clusters

Photon Emission Spectroscopy of Single Oxide-Supported Ag-Au Alloy Clusters

Modeling the optical response of nanoparticle-based surface plasmon resonance sensors

Interpretation of IR Spectra of Ultrathin Films

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