Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide

Menegotto, Thiago; Horowitz, Flávio

doi:10.1364/ao.53.002853

Cited by 15 publications

(11 citation statements)

References 28 publications

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“…In these studies, Maxwell-Garnett theory is normally used in the metal/dielectric nanostructures if , where ω is the frequency of the incident light, a is the radius of the metal nanospheres, and ε is the permittivity of the medium. Based on this theory, the effective permittivity ε eff is generally considered to be an average of the permittivity of the substrate ε sub and that of the external surrounding medium, ε ext , i.e., 19 20 . However, our results indicate that the dipole resonance wavelength of Ag NPs blueshifts or redshifts with increasing thickness of SiO 2 beneath or overcoating the Ag NPs, respectively.…”

Section: Discussionmentioning

confidence: 99%

Tunable Dipole Surface Plasmon Resonances of Silver Nanoparticles by Cladding Dielectric Layers

Liu

Sun

et al. 2015

Sci Rep

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The tunability of surface plasmon resonance can enable the highest degree of localised surface plasmon enhancement to be achieved, based on the emitting or absorbing wavelength. In this article, tunable dipole surface plasmon resonances of Ag nanoparticles (NPs) are realized by modification of the SiO2 dielectric layer thicknesses. SiO2 layers both beneath and over the Ag NPs affected the resonance wavelengths of local surface plasmons (LSPs). By adjusting the SiO2 thickness beneath the Ag NPs from 5 nm to 20 nm, the dipole surface plasmon resonances shifted from 470 nm to 410 nm. Meanwhile, after sandwiching the Ag NPs by growing SiO2 before NPs fabrication and then overcoating the NPs with various SiO2 thicknesses from 5 nm to 20 nm, the dipole surface plasmon resonances changed from 450 nm to 490 nm. The SiO2 cladding dielectric layer can tune the Ag NP surface charge, leading to a change in the effective permittivity of the surrounding medium, and thus to a blueshift or redshift of the resonance wavelength. Also, the quadrupole plasmon resonances were suppressed by the SiO2 cladding layer because the dielectric SiO2 can suppress level splitting of surface plasmon resonances caused by the Ag NP coupling effect.

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Section: Discussionmentioning

confidence: 99%

Tunable Dipole Surface Plasmon Resonances of Silver Nanoparticles by Cladding Dielectric Layers

Liu

Sun

et al. 2015

Sci Rep

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“…Nowadays this issue is resolved by fabricating porous nanostructures by tuning the η of the coating through porosity [10] . Effective medium approximation calculations help in generating the fill factor and voids to create porous structures according to the desired requirements [11,12] . Polman and his colleagues use a sol gel and soft imprint technology method to deposit 120 nm monolayer SiO 2 nanocylinders having a diameter of 245 nm (η=1.20) which diminishes reflectance to <0.57% in the visible region when monolayer porous silica coated on both sides of the glass [13] .…”

Section: Single Bilayer and Multilayer Ar Coatingsmentioning

confidence: 99%

A Mini Review: Antireflective Coatings Processing Techniques, Applications and Future Perspective

Khan¹,

Wu²,

Pan³

et al. 2017

Res. Rev. J Mat. Sci

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Antireflective coatings (AR) are widely applied to eliminate the unwanted surface reflections from the AR coated substrate. In different optoelectronic devices, AR coatings have potential usage in photovoltaic solar cells, sensors, display devices, automobile industries to reduce reflectance, glare and enhance light transmittance. Natural phenomenon inspires researchers, and they generate bionic AR coatings copying the nature such as moth eyes, or cicada wings to fabricate efficient light harvesting AR coatings. In the current review article, we analyse and evaluate critically the progress and recent development in the fabrication of AR thin films comprising organic coatings, inorganic coatings, polymer AR coatings and bionic AR coatings. We predominantly emphasise the AR coatings fabrication by different methods and pinpoints the technological challenges in their real-world reliability. Finally, we address the future challenges and potential strategies for their upcoming prospect.

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“…Therefore, in the present paper, the optical absorption of a multilayer with a square array of Ag NPs on LiNbO3 matrix is evaluated by using an extended Maxwell-Garnett (M-G) theory [4] and the Transfer Matrix Method (TMM) [5]. We study the compositional and geometrical parameters which influence the optical absorption of the multilayer.…”

Section: Introductionmentioning

confidence: 99%

PLASMONIC Ag-Linbo3 metamaterial: a study of dielectric and optical properties

DE LA CRUZ,

KANYINDA-MALU,

MUÑOZ SANTIUSTE

2023

NANOCON Conference Proeedings

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We report the optical and dielectric properties of a multilayer system constituted by ITO, an squarearrangement of Ag nanoparticles (NPs) on the uniaxial LiNbO3, the polymer PMMA and the substrate SiO2. We investigate the compositional and geometrical parameters dependences on the optical absorption of the stacked layers. The effective dielectric function of the ensemble aggregates of Ag NPs and uniaxial LiNbO3 crystal is treated through the extended Maxwell-Garnett approximation. The multilayer absorbance is determined by means of the Transfer Matrix Method. We demonstrate that an adequate choice of structural parameters such as NPs sizes, interparticle distances and layers thicknesses can produce an enhancement of optical absorption in the multilayer. In addition, we evaluate the dielectric modulus parameter of the effective medium layer in the perpendicular and parallel directions of the Ag NPs plane. For both directions, when the filling factor is big enough, we find the negative epsilon (NE) condition, typical characteristic observed in metamaterials.

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Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide

Cited by 15 publications

References 28 publications

Tunable Dipole Surface Plasmon Resonances of Silver Nanoparticles by Cladding Dielectric Layers

Tunable Dipole Surface Plasmon Resonances of Silver Nanoparticles by Cladding Dielectric Layers

A Mini Review: Antireflective Coatings Processing Techniques, Applications and Future Perspective

PLASMONIC Ag-Linbo3 metamaterial: a study of dielectric and optical properties

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