Synthesis of PbSe quantum dots and characterization of the nonlinear optical properties

Yanxu Zhang; Jin Zhao; Mengqi Lv; Endi Dai; Qiuling Zhao; Maorong Wang; Xia Wang

doi:10.1117/12.3046027

13 December 2024 Synthesis of PbSe quantum dots and characterization of the nonlinear optical properties

Yanxu Zhang, Jin Zhao, Mengqi Lv, Endi Dai, Qiuling Zhao, Maorong Wang, Xia Wang

Author Affiliations +

Proceedings Volume 13500, AOPC 2024: Micro-Nano Optics; 1350004 (2024) https://doi.org/10.1117/12.3046027
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

In this study, PbSe quantum dots (QDs) with subsequent characterization performed via X-ray diffraction (XRD) and transmission electron microscopy (TEM) were synthesized utilizing the thermal injection method. The absorption properties of the PbSe quantum dots were described using an ultraviolet-infrared spectrophotometer (UV-Vis), which shows that absorption in the range of 350 nm to 1600 nm, with an absorption typical peak near 1400 nm. Furthermore, the nonlinear optical properties of the quantum dots were systematically explored employing a femtosecond laser Z-scan system operating at a wavelength of 800 nm and a pulse width of 80 fs. As the incident laser power increasing, the nonlinear optical absorption behavior of the PbSe QDs underwent a discernible transition: from saturable absorption (SA） to reverse saturable absorption (RSA）. By fitting the experimental data, the corresponding nonlinear absorption coefficients were determined -3.538×10-8 and 1.362×10-8 respectively. The transition power of the two absorption states occurs at approximately ~3.4 mW. This nonlinear optical absorption phenomenon of PbSe QDs presents applying in optical limiting technology, laser modulation technology, and photodetectors.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yanxu Zhang, Jin Zhao, Mengqi Lv, Endi Dai, Qiuling Zhao, Maorong Wang, and Xia Wang "Synthesis of PbSe quantum dots and characterization of the nonlinear optical properties", Proc. SPIE 13500, AOPC 2024: Micro-Nano Optics, 1350004 (13 December 2024); https://doi.org/10.1117/12.3046027

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KEYWORDS

Quantum dots

Light absorption

Absorption

Nonlinear optics

Quantum optics experiments

Optical properties

Laser applications

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