Optical properties of Au-Ag alloys: An ellipsometric study

Peña‐Rodríguez, Ovidio; Caro, M.; Rivera, Alejandro; Olivares, J.; Perlado, J.M.; Caro, A.

doi:10.1364/ome.4.000403

Cited by 84 publications

(94 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Qualitatively, a close situation arises from thin‐alloyed materials (see e.g., ref. Au/Ag), in compliance with Matthiessen's rule . Dependence of weight coefficients on

\sqrt{ϵ_{_{normalF}}}

agree with the prediction of larger damping with increasing Fermi's velocity, Δ γ ∼ v F / L ( L = length scale).…”

Section: Geometrical and Damping Data (K = Bilayer Number)supporting

confidence: 82%

Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Mezzasalma

Janicki

Salamon

et al. 2018

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

A combination rule for electron damping in multilayer thin metal films is derived from a mean‐field picture and is applied to optical experimental data. The overall coefficient obeys a parallel law of pure materials damping, true〈γtrue〉 −1=gtrue¯ normalAγ normalA−1+gtrue¯ normalBγ normalB−1 (gtrue¯i<1), chemical specificity being involved by averaging over densities of low energy states in the free electron model. Geometric and static electromagnetic features of single layers couple via small Fermi's energy fractions (αi). An application is developed for thin Cu/Au and Au/Ag films, showing an apparently irregular damping trend in the film thickness (di = 2.5–7.5 nm). The inferred ⟨γ⟩'s agree in both cases with our data when |αi| = 10−2 ÷ 10−3 linearly increases with decreasing di, suggesting a coupling phenomenology that can bring new insights in the optics and plasmonics of nanostructures.

show abstract

“…Qualitatively, a close situation arises from thin‐alloyed materials (see e.g., ref. Au/Ag), in compliance with Matthiessen's rule . Dependence of weight coefficients on

\sqrt{ϵ_{_{normalF}}}

agree with the prediction of larger damping with increasing Fermi's velocity, Δ γ ∼ v F / L ( L = length scale).…”

Section: Geometrical and Damping Data (K = Bilayer Number)supporting

confidence: 82%

Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Mezzasalma

Janicki

Salamon

et al. 2018

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

show abstract

“…For the pristine Au nanocages, we assumed they had the geometry of a hollow cube with an edge length of 40 nm, a wall thickness of 3 nm, and 1/8 of spherical pores (12.5 nm in radius) at all corners. The dielectric constant was extracted from literature for Ag and Au compositions set to 48 % and 52 %, respectively (similar to the 1:1 ratio measured by ICP‐MS) . To model the Cu‐doped Au nanocages with smooth surfaces, we added an additional solid layer made of Au‐Cu alloy with a thickness of 1 and 3.5 nm on the outer surface of the original Au nanocages.…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric constant was extracted from literature for Ag and Au compositions set to 48 %a nd 52 %, respectively (similar to the 1:1r atio measured by ICP-MS). [29] To model the Cu-doped Au nanocages with smooth surfaces, we added an additional solid layer madeo f Au-Cu alloy with at hickness of 1a nd 3.5 nm on the outer surface of the originalA un anocages. The dielectric constanto f the Au-Cu alloy was taken to be pure Au, which we considered to be av alid assumption for two reasons: i)Aud ominated Cu in the deposited shell with am easured ratio of approximately 10:1, and ii)the dielectric constantso fp ure Au and Cu are very close over the wavelength range of interest.…”

Section: Full Papermentioning

confidence: 99%

Facile Synthesis of ⁶⁴Cu‐Doped Au Nanocages for Positron Emission Tomography Imaging

et al. 2016

View full text Add to dashboard Cite

This article reports a simple and reliable approach to the synthesis of Cu‐doped Au nanocages through the co‐deposition of Au and Cu on the surfaces (both outer and inner) of pre‐synthesized Au nanocages by reducing HAuCl4 and CuCl2 with ascorbic acid under alkaline conditions. By controlling the total amount of Au and Cu deposited and/or the molar ratio between these two metals, we were able to adjust the Cu content in the resultant Au nanocages. The localized surface plasmon resonance properties of the Cu‐doped Au nanocages resemble those of the conventional Au nanocages, with strong and tunable absorption in the near‐infrared region. When radioactive 64CuCl2 was used in combination with nonradioactive CuCl2 as a source to elemental Cu, we obtained 64Cu‐doped Au nanocages. The radioactive nanocages could serve as tracers for position emission tomography (PET) imaging, and they were found to accumulate effectively in both 4T1 and patient derived xenograft (PDX) tumor models due to the enhanced permeability and retention effect. Autoradiography analysis indicated a homogeneous intra‐tumoral distribution for these nanocages. Taken together, the 64Cu‐doped Au nanocages are promising for image‐guided cancer theranostics.

show abstract

“…(8,9) Subsequently, numerous research groups published the results of their alloy permittivity measurements. (10)(11)(12) It was shown that optical properties were strongly dependent on the deposition method employed, and, by extension, on the resulting extent of structural order (such as the degree of crystallinity, phase separation). This was illustrated in the recent experimental investigation of permittivity in 38 variations of the Au-Ag-Cu alloy system.…”

Section: Introductionmentioning

confidence: 99%

Alloy Materials for Plasmonic Refractive Index Sensing

2017

Sensors and Materials

View full text Add to dashboard Cite

We have numerically investigated the plasmonic refractive index sensor capabilities of Au-AgCu alloys using experimentally determined permittivity values. Calculations were performed by simulating the typical Kretschmann configuration of surface plasmon polariton (SPR) excitation, as well as the localized surface plasmon resonance (LSPR) of nanoparticles. Sensor performance was evaluated as the response to changes in the refractive index of the surrounding environment as well as the attainable separation of peaks. By considering not only the peak shift, but also the spectral separation, SPR and LSPR sensors can be discussed on equal terms. In studies of both SPR and LSPR, specific alloy configurations were found to be superior to pure gold.

show abstract

Optical properties of Au-Ag alloys: An ellipsometric study

Cited by 84 publications

References 23 publications

Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Facile Synthesis of ⁶⁴Cu‐Doped Au Nanocages for Positron Emission Tomography Imaging

Alloy Materials for Plasmonic Refractive Index Sensing

Contact Info

Product

Resources

About

Optical properties of Au-Ag alloys: An ellipsometric study

Cited by 84 publications

References 23 publications

Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Facile Synthesis of 64Cu‐Doped Au Nanocages for Positron Emission Tomography Imaging

Alloy Materials for Plasmonic Refractive Index Sensing

Contact Info

Product

Resources

About

Facile Synthesis of ⁶⁴Cu‐Doped Au Nanocages for Positron Emission Tomography Imaging