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Description:

A novel self-assembled Au@AuY-core/Au-shell nanoparticle (Au@AuY/Au NP) monolayer is proposed for the fine-tuning of plasmonics and enhanced third-order nonlinearity. Based on the different thermodynamics mechanisms of Au and Y ions, the compact Au@AuY/Au core-shell architectures are designed and surface-modified in fused silica (SiO2) with enhanced free electron density, mobility, and quantum size effect. The flexible modulation of plasmonics is realized, resulting in significant absorption enhancement (165% for interband absorption and 38% for free electron absorption, respectively) and fine-tuning of the localized surface plasma resonance (LSPR) band. In addition, the physical mechanism is investigated by density functional theory (DFT) and Mie theory, which reveals a transition from size-independence to size-dependence of LSPR owing to the synergistic effect of multiple physical factors such as free electron density and mobility. With the above advantages, the third-order nonlinearity is enhanced by 4.4 times compared with traditional Au NPs. It indicates the significant potential of Au@AuY/Au core-shell NP monolayer in the performance improvement of nonlinear photonic devices.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: plasmonics, core-shell alloy nanostructure, localized surface plasmon resonance, third-order nonlinerity, sequential ion implantation

Date published: 2023-05-22

Publisher: Elsevier BV

Journal:

• APPLIED SURFACE SCIENCE (ISSN: 01694332) vol. 631 p. 157582-157582

Funding:

• JSPS 22K04990

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.apsusc.2023.157582

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Updated at: 2024-02-28 16:30:10 +0900

Published on MDR: 2024-02-28 16:30:10 +0900