Experimental and theoretical determination of the plasmonic responses and shape distribution of colloidal metallic nanoparticles

Resano-Garcia, Amandine; Battie, Yann; Naciri, A. En; Akil, Suzanna; Chaoui, N.

doi:10.1063/1.4916917

Cited by 28 publications

(42 citation statements)

References 35 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different shapes have been reported with markedly different properties : spheres, triangles, cubes, ellipsoids for the most well-defined ones as well as urchins or rice-like shaped nanoobjects [4]. In terms of their plasmonic resonances for example, their optical properties are notably different [5][6][7]. Sometimes, their physical parameters can be identified in a simple manner.…”

Section: Current Size (2726 Words)mentioning

confidence: 99%

Second-Harmonic Scattering-Defined Topological Classes for Nano-Objects

Duboisset

Brevet

2019

J. Phys. Chem. C

View full text Add to dashboard Cite

Nano-object topology determination is a central question in nanoscience and remains a challenge to achieve in the absence of a supporting substrate and atomic resolution techniques. In this work, we demonstrate how second-harmonic scattering (SHS) is sensitive to the balance between the nano-object shape symmetry and size, thereby allowing for a SHS-defined topological definition. Although many data on nano-objects have been reported with this method so far, in most cases dispersed in liquid suspensions, no topological retrieval has been proposed. To reach this task, we have measured the second-harmonic scattered light from a series of representative nano-objects along two collection directions for well-defined polarization states. The experimental results are then recast within a general framework involving nonlinear emitting sources and the size as critical elements. This analysis leads to the classification of the nano-objects according to the topology defined by their SHS response.

show abstract

Section: Current Size (2726 Words)mentioning

confidence: 99%

Second-Harmonic Scattering-Defined Topological Classes for Nano-Objects

Duboisset

Brevet

2019

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…The mixture of Ag-NP inclusions and silica was modeled as an effective medium according to the shape distributed effective medium theory (SDEMT) introduced to describe the optical properties of spheroids distributed in shape. [9][10][11] We show in this study that the SDEMT model, based on a mean field and quasistatic approach, enables the explanation of the strong correlation between the shape distribution and the plasmon band. Previously, SDEMT was successfully used to study the extinction spectra of metallic colloidal solutions [9][10][11] and to determine the morphology of gold NPs in a photoresist film.…”

Section: Introductionmentioning

confidence: 78%

“…[9][10][11] We show in this study that the SDEMT model, based on a mean field and quasistatic approach, enables the explanation of the strong correlation between the shape distribution and the plasmon band. Previously, SDEMT was successfully used to study the extinction spectra of metallic colloidal solutions [9][10][11] and to determine the morphology of gold NPs in a photoresist film. 12 Here, the SDEMT is used to analyze the ellipsometric parameters with the additional difficulty of the consideration of the depth profile concentration of Ag-NPs in the SiO 2 layer.…”

Section: Introductionmentioning

confidence: 78%

Plasmonic properties of implanted Ag nanoparticles in SiO2 thin layer by spectroscopic ellipsometry

Battie

Naciri

Chaoui

et al. 2017

Journal of Applied Physics

View full text Add to dashboard Cite

We report an uncommon study of the insertion of distributions of both volume fraction and depolarization factors in the modeling of the plasmonic properties of implanted Ag nanoparticles (Ag-NPs) in a SiO2 layer when using spectroscopic ellipsometry (SE) characterization. The Ag-NPs were embedded in the SiO2 matrix by Ag+ ion implantation at various doses of 0.5 × 1016, 1 × 1016, 2 × 1016, and 5 × 1016 ions cm−2. The formation of the Ag-NPs in a host matrix of SiO2 was controlled by transmission electron microscopy (TEM). The Ag-NPs are self-organized in the layer, and their mean radius ranges between 2 and 20 nm. The optical properties of layers were extracted by modeling the SE parameters by taking into account the depth profile concentration of Ag-NPs. The mixture of SiO2 and Ag-NP inclusions was modeled as an effective medium according to the shape distributed effective medium theory (SDEMT). In addition to the optical responses, it is shown that this model enables the explanation of the impact of NP shape distribution on the plasmon band and provides precious information about the NP shape characteristics. A good agreement was obtained between ellipsometry and TEM results. The distribution of the volume fraction in the film was found to lead to a gradient of effective dielectric function which was determined by the SDEMT model. The effective dielectric function reveals distinct Ag plasmon resonance varying as the Ag+ ions dose is varied. The real part of the dielectric function shows a significant variation around the plasmon resonance in accordance with the Kramers-Kronig equations. All determined optical parameters by SDEMT are provided and discussed. We highlight that SE combined with SDEMT calculations can be considered as a reliable tool for the determination of the NP shape and volume fraction distributions without the need of TEM.

show abstract

“…This approach can also be used for other NPs such as silver, copper, or metallic alloy NPs, which present shape sensitive plasmon resonances. As we have previously reported, 24 the distribution of depolarization parameters of complex NP shape can also be estimated from absorption spectra. To avoid inaccurate characterization and to respect the limitations set by the model, the NP size must be higher than 10 nm but smaller than 80 nm and their concentration must be smaller than 30%.…”

mentioning

confidence: 91%

“…23 hE m i, hE npo i, and hE npp i are the spatial average electric fields inside the matrix, oblate, and prolate NPs, respectively. In the quasistatic limit, i.e., for NP size smaller than the wavelength, the electric field inside NPs is defined by 19,24 …”

mentioning

confidence: 99%