Numerical Modeling of Transient Absorption in Hybrid Dual-Plasmonic Au/CuS Nanostructures

瞬态(计算机编程) 等离子体子 对偶(语法数字) 吸收(声学) 纳米结构 超快激光光谱学 材料科学 纳米技术 光电子学 物理 计算机科学 光学 复合材料 激光器 艺术 文学类 操作系统
作者
Atefeh Habibpourmoghadam,Wenyong Xie,Patrick Bessel,André Niebur,Artsiom Antanovich,Dirk Dorfs,Jannika Lauth,Antonio Calà Lesina
出处
期刊:Cornell University - arXiv
标识
DOI:10.48550/arxiv.2406.09712
摘要

Transient absorption in plasmonic materials has recently attracted attention of the chemistry and optics communities as a technique to understand dynamic processes and hot carriers generation on ultrafast timescales. In this context, hybrid Au/CuS nanostructures were recently investigated via ultrafast pump-probe transient absorption spectroscopy revealing an exotic dual-plasmonic behavior. Namely, the excitation of a localized surface plasmon resonance (LSPR) in Au (pump at 551 nm) or CuS (pump at 1051 nm), leads to a transient response in the counterpart. This phenomenon was attributed to Landau damping, which stems from hot carrier generation and injection mechanisms at the interface between the two materials. Here, we employ numerical modeling to further clarify the origin of such response in hybrid Au/CuS nanostructures. The geometry of the hybrid nanostructures is first investigated via steady-state simulations (only probe), confirming an UFO-shaped configuration. We provide clarification on the role of the size ratio between Au and CuS. Finally, we present the simulation of transient absorption in the pump-probe regime, which qualitatively replicates our experimental observations, thus identifying the plasmonic response modified via Landau damping as the main governing mechanism. Our numerical approach provides an important tool for the modeling of transient absorption spectroscopy and can support experimental research on dual-plasmonic materials for applications in spectroscopy, photocatalysis, thermoplasmonics, sensing, and energy harvesting.

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