纳秒激光脉冲下基于 PbS 量子点和金纳米棒的等离子体-激发子纳米结构的非线性光学特性

IF 0.7 4区物理与天体物理 Q4 OPTICS

Journal of Russian Laser Research Pub Date : 2024-03-14 DOI:10.1007/s10946-024-10191-9

A. I. Zvyagin, T. A. Chevychelova, K. S. Chirkov, M. S. Smirnov, O. V. Ovchinnikov, E. P. Denisova

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引用次数: 0

摘要

我们介绍了在 10 ns Nd3+:YAG 激光二次谐波脉冲（532 nm）的影响下，在基于巯基乙酸钝化的 PbS 量子点和金纳米棒的质子-激子纳米结构中观察到的非线性光学响应的研究结果。我们的研究表明，在非线性折射的背景下，混合纳米结构成分的结合会导致 PbS 量子点的反向可饱和吸收增加。在量子点上镀一层单层 SiO2 可以减少这种效应，因为它阻断了电荷从量子点到金属纳米粒子的光转移过程，这一点可以通过 PbS 量子点在金纳米棒存在下的淬灭和发光寿命的缩短得到证实。

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Nonlinear Optical Properties of Plasmon–Exciton Nanostructures Based on PbS Quantum Dots and Gold Nanorods in the Field of Nanosecond Laser Pulses

We present the results of our study of nonlinear optical response observed in plasmon–exciton nanostructures based on PbS quantum dots passivated with thioglycolic acid and gold nanorods under the influence of 10 ns second harmonic pulses (532 nm) of Nd³⁺:YAG laser. We show that the association of components of a hybrid nanostructure leads to increase in the reverse saturable absorption in PbS quantum dots against the background of nonlinear refraction. Coating quantum dots with a monolayer of SiO₂ reduces this effect due to blocking the process of phototransfer of charge from a quantum dot to a metal nanoparticle, which is confirmed by the quenching and reduction in the luminescence lifetime of PbS quantum dots in the presence of gold nanorods.

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来源期刊

Journal of Russian Laser Research 物理-光学

CiteScore

1.50

自引率

22.20%

发文量

审稿时长

2 months

期刊介绍： The journal publishes original, high-quality articles that follow new developments in all areas of laser research, including: laser physics; laser interaction with matter; properties of laser beams; laser thermonuclear fusion; laser chemistry; quantum and nonlinear optics; optoelectronics; solid state, gas, liquid, chemical, and semiconductor lasers.