Details
| Original language | English |
|---|---|
| Pages (from-to) | 406-412 |
| Number of pages | 7 |
| Journal | East European Journal of Physics |
| Volume | 2023 |
| Issue number | 3 |
| Publication status | Published - 4 Sept 2023 |
Abstract
The article is focused on optical properties of nanostructures containing spherical gold nanoparticles of various radii. We explore correlation between the particle radius and the choice of permittivity model applied to describe optical absorption spectra of gold granules. The experiments show splitting of the absorption band of granular gold films to form a second absorption peak. The first peak is associated with the phenomenon of plasmon resonance, while the second one reflects quantum hybridization of energy levels in gold. Quantum effects are shown to prevail over size effects at a granule diameter of about 5-6 nm. The Mie theory gives a rigorous solution for the scattered electromagnetic field on a sphere taking into account optical properties of the latter, however, it does not specify the criteria for selecting a model to calculate dielectric permittivity. Both calculations and experiments confirm the limiting diameter of gold nanoparticles where the Hampe-Shklyarevsky model is applied. Meanwhile, this model is still unable to predict the splitting of the plasma absorption band. The data presented in the article can be used for a predetermined local field enhancement in composite media consisting of a biolayer and metal nanoparticles. The conducted research provides a deeper understanding of the influence of a terahertz high-intensity electromagnetic field localized in the space on quantum dots.
Keywords
- Absorption spectra, Gold granules, Hampe-Shklyarevsky model, Mie theory, Permittivity, Plasma absorption band
ASJC Scopus subject areas
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In: East European Journal of Physics, Vol. 2023, No. 3, 04.09.2023, p. 406-412.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Permittivity Model Selection Based on Size and Quantum-Size Effects in Gold Films
AU - Riabenko, Iuliia
AU - Shulga, Sergey
AU - Makarovskii, Nikolai
AU - Beloshenko, Konstantin
PY - 2023/9/4
Y1 - 2023/9/4
N2 - The article is focused on optical properties of nanostructures containing spherical gold nanoparticles of various radii. We explore correlation between the particle radius and the choice of permittivity model applied to describe optical absorption spectra of gold granules. The experiments show splitting of the absorption band of granular gold films to form a second absorption peak. The first peak is associated with the phenomenon of plasmon resonance, while the second one reflects quantum hybridization of energy levels in gold. Quantum effects are shown to prevail over size effects at a granule diameter of about 5-6 nm. The Mie theory gives a rigorous solution for the scattered electromagnetic field on a sphere taking into account optical properties of the latter, however, it does not specify the criteria for selecting a model to calculate dielectric permittivity. Both calculations and experiments confirm the limiting diameter of gold nanoparticles where the Hampe-Shklyarevsky model is applied. Meanwhile, this model is still unable to predict the splitting of the plasma absorption band. The data presented in the article can be used for a predetermined local field enhancement in composite media consisting of a biolayer and metal nanoparticles. The conducted research provides a deeper understanding of the influence of a terahertz high-intensity electromagnetic field localized in the space on quantum dots.
AB - The article is focused on optical properties of nanostructures containing spherical gold nanoparticles of various radii. We explore correlation between the particle radius and the choice of permittivity model applied to describe optical absorption spectra of gold granules. The experiments show splitting of the absorption band of granular gold films to form a second absorption peak. The first peak is associated with the phenomenon of plasmon resonance, while the second one reflects quantum hybridization of energy levels in gold. Quantum effects are shown to prevail over size effects at a granule diameter of about 5-6 nm. The Mie theory gives a rigorous solution for the scattered electromagnetic field on a sphere taking into account optical properties of the latter, however, it does not specify the criteria for selecting a model to calculate dielectric permittivity. Both calculations and experiments confirm the limiting diameter of gold nanoparticles where the Hampe-Shklyarevsky model is applied. Meanwhile, this model is still unable to predict the splitting of the plasma absorption band. The data presented in the article can be used for a predetermined local field enhancement in composite media consisting of a biolayer and metal nanoparticles. The conducted research provides a deeper understanding of the influence of a terahertz high-intensity electromagnetic field localized in the space on quantum dots.
KW - Absorption spectra
KW - Gold granules
KW - Hampe-Shklyarevsky model
KW - Mie theory
KW - Permittivity
KW - Plasma absorption band
UR - http://www.scopus.com/inward/record.url?scp=85171355505&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2210.17542
DO - 10.48550/arXiv.2210.17542
M3 - Article
AN - SCOPUS:85171355505
VL - 2023
SP - 406
EP - 412
JO - East European Journal of Physics
JF - East European Journal of Physics
SN - 2312-4334
IS - 3
ER -