Computational optimization of multi-material layered nanodimer for multipurpose applications in nanotechnology

In this paper, we use computational methods to investigate the plasmonic properties of multi-layered dimers. These dimers are composed of layers of gold–silica–gold and gold–silica–silver, with shifts in their core and middle layers. This asymmetry breaks the geometrical symmetry, revealing plasmon...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2023-12, Vol.129 (12), Article 871
Main Authors: Jamil, Saqib, Khalil, Usman Khan, Jamil, Saima, Farooq, Waqas
Format: Article
Language:English
Subjects:
Applied physics
Asymmetry
Broken symmetry
Characterization and Evaluation of Materials
Charge distribution
Condensed Matter Physics
Dimers
Dipole moments
Gold
Machines
Manufacturing
Materials science
Multilayers
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Plasmonics
Plasmons
Processes
Silicon dioxide
Silver
Surface charge
Surfaces and Interfaces
Symmetry
Thin Films
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Summary:In this paper, we use computational methods to investigate the plasmonic properties of multi-layered dimers. These dimers are composed of layers of gold–silica–gold and gold–silica–silver, with shifts in their core and middle layers. This asymmetry breaks the geometrical symmetry, revealing plasmon resonances that are typically invisible in concentric geometries. This study explains the origin of these resonances using plasmon hybridization theory, highlighting the interaction between primitive and multipolar modes in the core and shell of the investigated proposed structure. These interactions improve the coupling of the higher order modes to light by inducing a dipole moment. The asymmetry is attributed to the uneven distribution of surface charges, leading to a transition from multipolar to dipolar characteristics in the higher order modes. Through visual examination of the dipolar component in surface charge distributions, we qualitatively establish the relative amplitudes of the modes. Our results demonstrate the red-shifting of resonant wavelengths with increased core offset, resulted in the enhanced absorption rather than scattering. This computational study provide a terse depth for the deeper understanding towards the plasmonic behavior in multilayered dimers with core and middle layer shifts, uncovering the underlying mechanisms of symmetry breaking.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-023-07144-5