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arXiv 2406.09712physics.opticsphysics.chem-ph
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混合双等离激元 Au/CuS 纳米结构中瞬态吸收的数值建模

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

Atefeh Habibpourmoghadam, Wenyong Xie, Patrick Bessel, André Niebur, Artsiom Antanovich, Dirk Dorfs, Jannika Lauth, Antonio Calà Lesina

AI总结:

本文通过稳态与泵浦-探测数值模拟研究混合 Au/CuS 纳米结构的双等离激元瞬态吸收,确认其 UFO 形几何及尺寸比作用,并证明 Landau damping 是主导机制。

摘要:

等离激元材料中的瞬态吸收作为一种理解超快时间尺度上动态过程和热载流子产生的技术,近来引起了化学和光学领域的关注。在此背景下,混合 Au/CuS 纳米结构最近通过超快泵浦-探测瞬态吸收光谱进行了研究,揭示出一种奇特的双等离激元行为。也就是说,激发 Au(551 nm 泵浦)或 CuS(1051 nm 泵浦)中的局域表面等离激元共振(LSPR),会在对应材料中产生瞬态响应。这一现象被归因于 Landau damping(朗道阻尼),其源于两种材料界面处的热载流子产生和注入机制。本文采用数值建模进一步阐明混合 Au/CuS 纳米结构中这种响应的来源。首先通过稳态模拟(仅探测)研究混合纳米结构的几何形态,确认了 UFO 形构型。本文阐明了 Au 与 CuS 之间尺寸比例的作用。最后,本文给出了泵浦-探测状态下瞬态吸收的模拟,定性复现了实验观察结果,从而确认经 Landau damping 改变的等离激元响应是主要控制机制。本文的数值方法为瞬态吸收光谱建模提供了重要工具,并可支持双等离激元材料在光谱学、光催化、热等离激元学、传感和能量收集应用方面的实验研究。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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