Surface Plasmon Resonance Effect on the Optical Properties of TiO2 Doped by Noble Metals Nanoparticles

Nanocomposite thin films composed of a TiO2 matrix doped with noble metals nanoparticles (MNPS), Au and Ag, were deposited on Si (100) and glass substrates by dc magnetron sputtering. The samples were annealed in a protective atmosphere at temperatures ranging from 200 to 700 °C. The main goal of this work is to characterize and compare the Surface Plasmon Resonance (SPR) behaviour in both systems. The studies have been focused on the growth of the nanoclusters and on their role on the optical properties of the films. Size, shape and distribution of the nanoclusters embedded on the titanium oxide dielectric matrix are reported as key factors on the SPR behaviour in both systems (Au:TiO2 and Ag:TiO2). The MNPs grew due to diffusion mechanisms, which were led by the annealing treatments, even at the highest annealing temperatures. Evidences of the correlation between the nanocomposite film structural changes and the evolution of the optical properties due to the SPR activity are reported. The SPR phenomenon manifests itself as a wide band on the visible range on the absorption spectra, and it is confirmed by an important change on the surface colour tones of the samples.

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Optical Properties of DLC:SiOx and Ag Multilayer Films: Surface Plasmon Resonance Effect

Materials Science ◽

10.5755/j01.ms.22.4.13194 ◽

2016 ◽

Vol 22 (4) ◽

Cited By ~ 1

Author(s):

Arvydas ČIEGIS ◽

Vitoldas KOPUSTINSKAS ◽

Šarūnas MEŠKINIS ◽

Andrius VASILIAUSKAS

Keyword(s):

Optical Properties ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Resonance Effect ◽

Multilayer Films ◽

Surface Plasmon Resonance Effect

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Investigation to Localized Surface Plasmon Resonance Properties of Non-Noble Metals: Fe, Ni, and Ni80Fe20

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.855.243 ◽

2020 ◽

Vol 855 ◽

pp. 243-247

Author(s):

Muhammad Sujak ◽

Dede Djuhana

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Localized Surface Plasmon Resonance ◽

Noble Metals ◽

Localized Surface Plasmon ◽

Visible Range ◽

Metallic Nanoparticle ◽

Plasmonic Material ◽

Systematic Understanding

In this work, we have investigated the localized surface plasmon resonance profile of promising non-noble metals such as nickel (Ni), iron (Fe), and permalloy (Ni80Fe20) as an alternative plasmonic material. The nanoparticle formed a sphere with varying the diameter from 10 nm to 200 nm with increment 10 nm, and the medium of nanoparticles is air (1+0i). The calculation was carried out by metallic nanoparticle boundary element method package. Furthermore, our result shows that increasing diameter of particles (iron, nickel, and permalloy) would increase the efficiency of ratio scattering to absorption, and the LSPRs peak led to shift to lower energy (red-shift). The ratio of scattering to absorption indicates a strengthening of radiative damping in large particle-size which largely used in biological cell imaging. However, iron’s efficiency much lower than nickel and permalloy. For example, at the highest diameter, such 200 nm, the efficiency of iron is just over around 1.25 while nickel and permalloy well under nearly 2.0. In addition, nickel and permalloy’s LSPR happened in visible range. Our results serve a systematic understanding of the shifting spectrum pattern for prospective ferromagnetic materials

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Controlling linear and nonlinear optical properties associated with surface plasmon resonance effect of colloidal gold nanoparticles

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference ◽

10.1109/cleoe-eqec.2009.5196444 ◽

2009 ◽

Author(s):

M. A. R. C. Alencar ◽

E. J. S. Fonseca ◽

C. E. A. Santos ◽

S. F. A. Moraes ◽

M. A. Gelesky ◽

...

Keyword(s):

Gold Nanoparticles ◽

Optical Properties ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Nonlinear Optical ◽

Resonance Effect ◽

Surface Plasmon Resonance Effect ◽

Colloidal Gold Nanoparticles ◽

Linear And Nonlinear

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Optical Characterization of Ultra-Thin Films of Azo-Dye-Doped Polymers Using Ellipsometry and Surface Plasmon Resonance Spectroscopy

Photonics ◽

10.3390/photonics8020041 ◽

2021 ◽

Vol 8 (2) ◽

pp. 41

Author(s):

Najat Andam ◽

Siham Refki ◽

Hidekazu Ishitobi ◽

Yasushi Inouye ◽

Zouheir Sekkat

Keyword(s):

Refractive Index ◽

Optical Properties ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Spectroscopic Ellipsometry ◽

Plasmon Resonance ◽

Complex Refractive Index ◽

Resonance Spectroscopy ◽

Doped Polymers

The determination of optical constants (i.e., real and imaginary parts of the complex refractive index (nc) and thickness (d)) of ultrathin films is often required in photonics. It may be done by using, for example, surface plasmon resonance (SPR) spectroscopy combined with either profilometry or atomic force microscopy (AFM). SPR yields the optical thickness (i.e., the product of nc and d) of the film, while profilometry and AFM yield its thickness, thereby allowing for the separate determination of nc and d. In this paper, we use SPR and profilometry to determine the complex refractive index of very thin (i.e., 58 nm) films of dye-doped polymers at different dye/polymer concentrations (a feature which constitutes the originality of this work), and we compare the SPR results with those obtained by using spectroscopic ellipsometry measurements performed on the same samples. To determine the optical properties of our film samples by ellipsometry, we used, for the theoretical fits to experimental data, Bruggeman’s effective medium model for the dye/polymer, assumed as a composite material, and the Lorentz model for dye absorption. We found an excellent agreement between the results obtained by SPR and ellipsometry, confirming that SPR is appropriate for measuring the optical properties of very thin coatings at a single light frequency, given that it is simpler in operation and data analysis than spectroscopic ellipsometry.

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Numerical Study on the Surface Plasmon Resonance Tunability of Spherical and Non-Spherical Core-Shell Dimer Nanostructures

Nanomaterials ◽

10.3390/nano11071728 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1728

Author(s):

Joshua Fernandes ◽

Sangmo Kang

Keyword(s):

Refractive Index ◽

Optical Properties ◽

Surface Plasmon Resonance ◽

Aspect Ratio ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Shell Thickness ◽

Numerical Study ◽

Field Enhancement ◽

Core Shell

The near-field enhancement and localized surface plasmon resonance (LSPR) on the core-shell noble metal nanostructure surfaces are widely studied for various biomedical applications. However, the study of the optical properties of new plasmonic non-spherical nanostructures is less explored. This numerical study quantifies the optical properties of spherical and non-spherical (prolate and oblate) dimer nanostructures by introducing finite element modelling in COMSOL Multiphysics. The surface plasmon resonance peaks of gold nanostructures should be understood and controlled for use in biological applications such as photothermal therapy and drug delivery. In this study, we find that non-spherical prolate and oblate gold dimers give excellent tunability in a wide range of biological windows. The electromagnetic field enhancement and surface plasmon resonance peak can be tuned by varying the aspect ratio of non-spherical nanostructures, the refractive index of the surrounding medium, shell thickness, and the distance of separation between nanostructures. The absorption spectra exhibit considerably greater dependency on the aspect ratio and refractive index than the shell thickness and separation distance. These results may be essential for applying the spherical and non-spherical nanostructures to various absorption-based applications.

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