Temperature-dependent permittivity of silver and implications for thermoplasmonics

Ferrera, Marzia; Magnozzi, Michele; Bisio, Francesco; Canepa, M.

doi:10.1103/physrevmaterials.3.105201

Cited by 30 publications

(31 citation statements)

References 50 publications

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“…The crossing of the plasma frequency is actually responsible for the sharp features observed in the SE spectra of Figure 3 , where the dip in the Δ and the sharp rise in Ψ are the fingerprints of the crossover from dielectric to metallic behavior. 58 We point out that the appearance of a plasma frequency and its doping dependence are already qualitatively observable from the raw SE spectra. The thickness of the films corresponding to the best fit was 110 ± 10, 145 ± 15, and 145 ± 15 nm for Al-doped ZnO films (2 and 4 at.…”

Section: Resultsmentioning

confidence: 78%

Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium

et al. 2022

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Understanding the interaction between plasmonic nanoparticles and transparent conductive oxides is instrumental to the development of next-generation photovoltaic, optoelectronic, and energy-efficient solid-state lighting devices. We investigated the optical response of hybrid media composed of gold nanoparticles deposited on aluminum-doped zinc oxide thin films with varying doping concentration by spectroscopic ellipsometry. The dielectric functions of bare AZO were addressed first, revealing doping-induced effects such as the band gap shift and the appearance of free carriers. In the hybrid media, a blue-shift of the localized surface plasmon resonance of Au NPs as a function of increasing Al doping of the substrate was observed, ascribed to the occurrence of a charge transfer between the two materials and the doping-dependent variation of the polarizability of the substrate.

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Section: Resultsmentioning

confidence: 78%

Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium

et al. 2022

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“…The crossing of the plasma frequency is actually responsible for the sharp features observed in the SE spectra of Figure 3, where the dip in the ∆ and the sharp rise in Ψ are the fingerprints of the cross-over from dieletric to metallic behaviour. 58 We point out that the appearance of a plasma frequency and its doping dependence are already qualitatively observable from the raw SE spectra. The thickness of the films corresponding to the best fit was 110 ± 10 nm, 145 ± 15 nm and 145 ± 15 nm for Al-doped ZnO films (2 at.% and 4 at.%, respectively), while the effective optical roughness was found to be approximately 4.0 ± 0.1 nm for ZnO, 6.0 ± 0.1 nm for the 2 at.% and and 4.6 ± 0.2 nm for the 4 at.% AZO film.…”

Section: Optical Properties Of Azo Filmsmentioning

confidence: 78%

Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium

Sygletou,

Benedetti,

di Bona

et al. 2022

Preprint

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“…and thin Ag films (up to 900 K in the wavelength range of 330 − 2000 nm [67]); similar data sets can be found in [76][77][78][79]. Specifically, labeling the ambient properties (i.e., the vanishing incident intensity limit) by a subscript 0, we model the dependence of the metal permittivity on the temperature by a second-order polynomial, namely,…”

Section: Configurationmentioning

confidence: 81%

The thermo-optic nonlinearity of single metal nanoparticles under intense continuous-wave illumination

Un,

Sivan

2020

Preprint

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Over the last few decades, extensive previous studies of the nonlinear response of metal nanoparticles report a wide variation of nonlinear coefficients, thus, revealing a highly confused picture of the underlying physics. This naturally prevents rational design of these systems for practical devices. Here, we provide a systematic study of the nonlinear response of metal spheres under continuous wave illumination within a purely thermal model, i.e., whereby the illumination only acts to modify the optical and thermal parameters via their dependence on the temperature. We characterize the strong dependence of the temperature rise and overall thermo-optic nonlinear response on the particle size and permittivity, on the optical and thermal host properties, as well as on the thermo-derivatives of these properties. This dependence on the non-intrinsic parameters explains why it is inappropriate to extract an intrinsic nonlinear coefficient from a specific system; equivalently, it explains the large differences in reported values for such systems, as well as for more complicated metal-dielectric systems and even pulsed illumination schemes. Despite the revealed complex multi-parameter dependence, we managed to uncover a rather simple behaviour of the nonlinear response. In particular, we show that the nonlinearity coefficients exhibit a dependence on the illumination intensity which mimics the dependence of the temperature itself on the illumination intensity, namely, it grows for small nanoparticle sizes, reaches a maximum and then decreases monotonically for larger nanoparticles. The improved modelling allows us to demonstrate an overall nonlinear response which is about a 1000 times higher than in other strongly nonlinear systems (e.g., -near-zero systems); it also provides an excellent match to experimental measurements of the scattering from a single metal nanoparticles, thus, confirming the dominance of the thermal nonlinear mechanism. Our work lays the foundations for an overall evaluation of previous studies of the nonlinear response of metal-dielectric system under general conditions.

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Temperature-dependent permittivity of silver and implications for thermoplasmonics

Cited by 30 publications

References 50 publications

Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium

Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium

Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium

The thermo-optic nonlinearity of single metal nanoparticles under intense continuous-wave illumination

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