文章基本信息

标题：Enhanced broadband nonlinear optical response of TiO2/CuO nanosheets via oxygen vacancy engineering
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作者：Li Dong ; Hongwei Chu ; Xiao Wang 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2021
卷号：10
期号：5
页码：1541-1551
DOI：10.1515/nanoph-2020-0649
出版社：Walter de Gruyter GmbH
摘要：Cupric oxide (CuO), as a transition metal oxide (TMO) semiconductor, has attracted tremendous attention for various applications. In the present work, we synthesize the CuO nanosheets modified by TiO 2 nanoparticles via a facile, non-toxic two-step method. Subsequently, the morphology and the structures of CuO and TiO 2 /CuO nanocomposites are investigated. By utilizing the common Z-scan technology, broadband nonlinear optical (NLO) properties of the as-prepared CuO nanosheets and TiO 2 /CuO nanocomposites are demonstrated, elucidating the enhancement on the NLO response via the TiO 2 dopant, which is attributed to the more oxygen vacancies and the formed p-n junctions. Furthermore, CuO nanosheets and TiO 2 /CuO nanocomposites are implemented to the passively Q-switched bulk lasers operating in the near-infrared (NIR) region, generating broadband ultrastable pulses. Ultimately, TiO 2 /CuO nanocomposites were intergrated in a passive mode-locking bulk laser for the first time, achieving stable mode-locked pulses and verifying its ultrafast optical response potential. Our results illustrate the tremendous prospects of the CuO nanosheets modified by oxygen vacancy engineering as a broadband NLO material in ultrafast photonics field.
关键词：nanocomposites; nonlinearity; optical properties enhancement; oxygen vacancy defects; saturable absorber.