氧空位驱动Bi2O2Se的带隙调谐与超快激光性能

IF 6.6 2区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qingling Tang, Zhongben Pan, Zeshang Ji, Hongwei Chu, Han Pan, Dechun Li
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引用次数: 0

摘要

Bi2O2Se具有良好的空气稳定性、高迁移率和可调谐的带隙,在光子调制器中显示出巨大的潜力。本研究提出了空位工程作为改善其光学特性和增强非线性响应的有效方法。通过理论模拟和实验方法,系统研究了氧空位缺陷修饰Bi2O2Se的光学性质。氧空位通过引入中间能级、改变电子结构、减小带隙、引起线性吸收光谱的红移以及在1 μm附近形成新的吸收带来增强光子与材料的相互作用。氩气退火增加了氧空位的浓度,实验吸收光谱与理论预测非常吻合。为了评估氧空位对非线性光学响应的影响,将退火前后的Bi2O2Se作为可饱和吸收剂应用于调q和锁模激光器中。退火后的Bi2O2Se峰功率增加了4.42倍,脉冲宽度减小了115.9 fs, 3db谱宽扩展了2.36 nm。这些发现表明,空位工程是优化Bi2O2Se非线性光学特性的一种直接有效的策略,可以为先进的光子应用做出贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Oxygen vacancy-driven bandgap tuning and ultrafast laser performance in Bi2O2Se
Bi2O2Se, with its excellent air stability, high mobility, and tunable bandgap, shows great potential for photonic modulators. This study proposes vacancy engineering as an effective method to refine its optical properties and enhance the nonlinear response. The optical properties of Bi2O2Se modified by oxygen vacancy defects were systematically investigated through theoretical simulations and experimental methods. Oxygen vacancies enhance photon–material interactions by introducing intermediate energy levels, altering the electronic structure, reducing the bandgap, inducing a redshift in the linear absorption spectrum, and forming a new absorption band near 1 μm. Argon annealing increased the concentration of oxygen vacancies, and the experimental absorption spectra showed excellent agreement with theoretical predictions. To evaluate the impact of oxygen vacancies on the nonlinear optical response, Bi2O2Se before and after annealing was employed as a saturable absorber in Q-switched and mode-locked lasers. The annealed Bi2O2Se exhibited a 4.42-fold increase in peak power, a 115.9 fs reduction in pulse width, and a 2.36 nm expansion in 3 dB spectral width. These findings indicate that vacancy engineering is a direct and effective strategy for optimizing the nonlinear optical properties of Bi2O2Se, which can contribute to advanced photon applications.
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来源期刊
Nanophotonics
Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
13.50
自引率
6.70%
发文量
358
审稿时长
7 weeks
期刊介绍: Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.
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