Using Femtosecond Laser Light to Investigate the Concentration- and Size-Dependent Nonlinear Optical Properties of Laser-Ablated CuO Quantum Dots.

IF 4.4 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanomaterials Pub Date : 2024-10-18 DOI:10.3390/nano14201674

Mohamed Ashour, Rasha Ibrahim, Yasmin Abd El-Salam, Fatma Abdel Samad, Alaa Mahmoud, Tarek Mohamed

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Abstract

In this work, the nonlinear optical (NLO) properties of CuO nanoparticles (CuO NPs) were studied experimentally using the pulsed laser ablation (PLA) technique. A nanosecond Nd: YAG laser was employed as the ablation excitation source to create CuO NPs in distilled water. Various CuO NPs samples were prepared at ablation periods of 20, 30, and 40 min. Utilizing HR-TEM, the structure of the synthesized CuO NPs samples was verified. In addition, a UV-VIS spectrophotometer was used to investigate the linear features of the samples. The Z-scan technique was utilized to explore the NLO properties of CuO NPs samples, including the nonlinear absorption coefficient (β) and nonlinear refractive index (n2). An experimental study on the NLO features was conducted at a variety of excitation wavelengths (750-850 nm), average excitation powers (0.8-1.2 W), and CuO NPs sample concentrations and sizes. The reverse saturable absorption (RSA) behavior of all CuO NPs samples differed with the excitation wavelength and average excitation power. In addition, the CuO NPs samples demonstrated excellent optical limiters at various excitation wavelengths, with limitations dependent on the size and concentration of CuO NPs.

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利用飞秒激光研究激光刻蚀氧化铜量子点的浓度和尺寸非线性光学特性。

本研究利用脉冲激光烧蚀（PLA）技术对氧化铜纳米粒子（CuO NPs）的非线性光学（NLO）特性进行了实验研究。使用纳秒级 Nd: YAG 激光作为烧蚀激发光源，在蒸馏水中生成 CuO NPs。在 20、30 和 40 分钟的烧蚀时间内制备了各种 CuO NPs 样品。利用 HR-TEM 验证了合成的 CuO NPs 样品的结构。此外，还使用紫外-可见分光光度计研究了样品的线性特征。利用 Z 扫描技术探索了 CuO NPs 样品的 NLO 特性，包括非线性吸收系数（β）和非线性折射率（n2）。在不同的激发波长（750-850 nm）、平均激发功率（0.8-1.2 W）以及 CuO NPs 样品浓度和尺寸下，对 NLO 特性进行了实验研究。所有 CuO NPs 样品的反向可饱和吸收 (RSA) 行为都随激发波长和平均激发功率的不同而不同。此外，CuO NPs 样品在不同的激发波长下都表现出优异的光学限制性，其限制性取决于 CuO NPs 的尺寸和浓度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.50

自引率

9.40%

发文量

3841

审稿时长

14.22 days

期刊介绍： Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.