Year: 2024
Type: article
Abstract: In this Letter, we present a theoretical study based on the Lorentz function and harmonic oscillator model to explore temporal dynamics of charge transfer plasmon (CTP) resonances. By fitting scattering curves and near-field oscillations, we determine the dephasing time of CTP modes in conductively connected gold nanodisk dimers. We show that, compared with the well-known particle plasmon and dimer plasmon modes, the CTP mode has a narrow spectral width and longer lifetime. Moreover, quantitative analysis of optical near-fields reveals that CTP modes oscillate completely out-of-phase with the particle plasmon and dimer plasmon modes. The dephasing time, near-field decay rate and charge transfer time of the CTP mode are found to be on a few femtosecond timescales, implying that conductively connected plasmonic nanoparticles hold great promise as channels for ultrafast transfer of information in all-optical computing and optoelectronic devices.
Source: Optics Letters
DOI: 10.1364/ol.547590
Authors: Alemayehu Nana Koya, Longnan Li, Wei Li
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: G4840284919, G5063899986
OpenAlex ID: W4405287854