Wavelength-dependent nonlinear optical properties of hexagonal gold nanoparticles and its application in pulsed lasers

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-03-27 DOI:10.1016/j.optcom.2025.131808

Yayuan Tang, Zehua Li, Zuyong Gao

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Abstract

We have studied the nonlinear refractive index, saturation absorption characteristics, and ultrafast carrier dynamics of hexagonal gold nanoparticles at broadband. By leveraging Z-scan technique and time-resolved transient absorption spectroscopy, we unveil the nonlinear optical behavior of gold nanoparticles and quantitatively determine their nonlinear parameters. Our experimental results underscore the prominent nonlinear optical effects exhibited by gold nanoparticles under intense electromagnetic fields, encompassing saturation absorption (SA) and self-focusing phenomena. Notably, the ultrafast carrier dynamics of gold nanoparticles are found to be strongly influenced by probe wavelength. We further studied the passively Q-switched pulse lasers generation using gold hexagonal nanoparticles as saturated absorbent at 1064 nm and 2800 nm. These findings not only deepen our understanding of the nonlinear optical properties of gold nanoparticles but also offer valuable insights for the development of novel nonlinear optical devices and applications.

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六方金纳米粒子随波长变化的非线性光学特性及其在脉冲激光器中的应用

研究了六方金纳米粒子的非线性折射率、饱和吸收特性和宽带超快载流子动力学。利用z扫描技术和时间分辨瞬态吸收光谱，揭示了金纳米粒子的非线性光学行为，并定量确定了其非线性参数。我们的实验结果强调了金纳米粒子在强电磁场下表现出的突出的非线性光学效应，包括饱和吸收（SA）和自聚焦现象。值得注意的是，金纳米粒子的超快载流子动力学受到探针波长的强烈影响。我们进一步研究了在1064 nm和2800 nm处使用金六方纳米粒子作为饱和吸收剂产生被动调q脉冲激光器。这些发现不仅加深了我们对金纳米粒子非线性光学性质的理解，而且为新型非线性光学器件和应用的发展提供了有价值的见解。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.