Optical Properties of Dimeric Metal Nanoparticles (Gold and Silver) Connected by Conductive Bridge

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Mosaddegh, Mohammad | 2022

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 55495 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Sadighi Bonabi, Rasoul
Abstract:
Over the past two decades, scientists have been intensely interested in the development of metallic nanostructures for their applications in industry and medicine due to their attractive optical properties resulting from surface-localized plasmon resonance (LSPR).In this Thesis, plasmonic resonance modes in bridge dimer (Gold and Silver) are numerically investigated. Without the junction, A high-energy resonant mode called the bonding dimer plasmon (BDP) mode appears in the optical spectrum of the dimer, which is caused by the coupling of each of the nanoparticle plasmon modes. But in bridge dimer, two resonances called screened bonding dimer plasmon mode (SBDP) and charge transfer plasmon mode (CTP) appear in the optical spectrum of that structure. It was found that the state of both resonance modes is strongly influenced by the geometry of nanoparticles, the geometry of the junction and the noble metals that make up these geometries. bridge dimer lead to low-energy, controllable plasmon mode in the mid-infrared region, which is suitable for new applications such as molecular sensing and nano-optoelectronic devices.
Keywords:
Localized Surface Plasmon Resonance ; Localized Surface Plasmons ; Quantum Corrections ; Bonding Dimer Plasmon (BDP) ; Classical Local Model ; Classical Non-Local Model