Third-Order Nonlinear Optical Properties of Aqueous Silver Sulfide Quantum Dots

Wide spectral wavelength range (500–1600 nm) measurements of nonlinear optical properties of silver sulfide (Ag2S, with 2- or 3-mercaptopropionic acid, 2 or 3MPA ligands) quantum dots (QDs) in aqueous colloidal solutions were performed using the Z-scan technique with tunable ∼55 fs laser pulses at 1 kHz. We have identified regions of the occurrence of various NLO effects including two-photon absorption, nonlinear refraction, as well as saturation of one-photon absorption. At the same time, we evaluated the relationship between the properties of the QDs and the variation of the material that covers their surface. The peak two-photon absorption cross section (σ2) values were determined to be 632 ± 271 GM (at 850 nm) for Ag2S-2MPA QDs and 772 ± 100 GM (at 875 nm) for Ag2S-3MPA QDs. The physicochemical factors influencing the three-dimensional self-organization of Ag2S QDs in water as well as their impact on spectroscopic properties were also investigated.---.dpt files are plain text files output by the measurement software

本研究采用Z扫描技术（Z-scan），以重复频率1 kHz、脉宽约55飞秒（femtosecond, fs）的可调谐激光脉冲，对水相胶体溶液中负载2-巯基丙酸或3-巯基丙酸（2MPA/3MPA）配体的硫化银（Ag₂S）量子点（Quantum Dots, QDs）的非线性光学特性进行了500–1600 nm宽光谱波段的测量。本研究已观测到多种非线性光学（Nonlinear Optical, NLO）效应的发生区域，涵盖双光子吸收、非线性折射与单光子吸收饱和现象。与此同时，本研究评估了量子点的特性与其表面包覆材料变化之间的关联。经测定，负载2MPA的Ag₂S量子点在850 nm波长处的峰值双光子吸收截面（σ₂）为632 ± 271 GM（Goeppert-Mayer），负载3MPA的Ag₂S量子点在875 nm波长处的峰值双光子吸收截面为772 ± 100 GM（Goeppert-Mayer）。本研究还探究了影响硫化银量子点在水中三维自组织行为的物理化学因素，以及这些因素对其光谱特性的影响。.dpt格式文件为测量软件输出的纯文本文件。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于水相硫化银量子点的三阶非线性光学性质研究，通过Z-scan技术测量了500-1600 nm波长范围内的非线性光学效应，包括双光子吸收、非线性折射和吸收饱和，并比较了不同表面配体（2MPA和3MPA）的影响。数据集提供了具体的实验数据文件，如双光子吸收截面值（例如Ag2S-2MPA QDs为632 ± 271 GM），并探讨了量子点在水中的自组织行为及其光谱性质，适用于化学和物理领域的研究。