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Enhanced broadband nonlinear optical response of TiO2/CuO nanosheets via oxygen vacancy engineering
Nanophotonics ( IF 7.5 ) Pub Date : 2021-03-01 , DOI: 10.1515/nanoph-2020-0649
Li Dong 1 , Hongwei Chu 1 , Xiao Wang 2 , Ying Li 3 , Shengzhi Zhao 1 , Dechun Li 1
Affiliation  

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.

中文翻译:

通过氧空位工程增强了TiO2 / CuO纳米片的宽带非线性光学响应

氧化铜(CuO)作为过渡金属氧化物(TMO)半导体,在各种应用中引起了极大的关注。在目前的工作中,我们通过一种简便,无毒的两步法合成了TiO 2纳米粒子修饰的CuO纳米片。随后,研究了CuO和TiO 2 / CuO纳米复合材料的形貌和结构。通过使用常见的Z扫描技术,展示了所制备的CuO纳米片和TiO 2 / CuO纳米复合材料的宽带非线性光学(NLO)特性,阐明了通过TiO 2掺杂剂对NLO响应的增强,这归因于更多的氧空位和形成的pn结。此外,CuO纳米片和TiO 2 / CuO纳米复合材料可用于在近红外(NIR)区域工作的被动Q开关体激光器,产生宽带超稳定脉冲。最终,TiO 2 / CuO纳米复合材料首次在被动锁模体激光器中集成,实现了稳定的锁模脉冲并验证了其超快的光学响应潜力。我们的结果说明了氧空位工程修饰的CuO纳米片作为超快光子学领域中的宽带NLO材料的巨大前景。
更新日期:2021-03-18
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