Highly Defective Nanocrystals as Ultrafast Optical Switches: Nonequilibrium Synthesis and Efficient Nonlinear Optical Response,Chemistry of Materials

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Highly Defective Nanocrystals as Ultrafast Optical Switches: Nonequilibrium Synthesis and Efficient Nonlinear Optical Response
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-11-20 , DOI: 10.1021/acs.chemmater.0c03235
Xiaowen Zhang _{1,

2,

3} , Duoduo Zhang ₄ , Dezhi Tan ₁ , Yuehui Xian ₄ , Xiaofeng Liu ₄ , Jianrong Qiu _{1,

5}

Affiliation

Exploring novel photonic materials with efficient nonlinear optical response is of great significance for ultrafast photonics. The effective defect control approach is a promising technique for the development of ultrafast optical devices because the optical properties and electronic structure of materials depend to a large extent on their defect structure. Here, we demonstrate a universal nonequilibrium strategy of femtosecond laser processing to synthesize a broad range of colloidal nanocrystals with simultaneous generation of abundant defects at room temperature. The defect states endow the nanocrystals with broadband absorption and enhanced nonlinear optical response in the near-infrared region. The highly defective nanocrystals exhibit an ultrafast optical response of about 160 fs and are used to drive an ultrafast optical switch for generation of passively Q-switched laser pulses with a pulse duration of 910 ns at 1.0 μm. The nonequilibrium synthetic strategy offers a scalable and versatile technique for the exploration of defect-mediated physical chemistry and high-performance nonlinear optical devices.

中文翻译：

高度缺陷的纳米晶体作为超快光学开关：非平衡合成和有效的非线性光学响应

探索具有有效非线性光学响应的新型光子材料对于超快光子学具有重要意义。有效的缺陷控制方法是开发超快光学器件的有前途的技术，因为材料的光学特性和电子结构在很大程度上取决于其缺陷结构。在这里，我们证明了飞秒激光加工的通用非平衡策略，可以在室温下同时产生大量缺陷的同时，合成多种胶体纳米晶体。缺陷状态使纳米晶体在近红外区域具有宽带吸收和增强的非线性光学响应。高度缺陷的纳米晶体表现出约160 fs的超快光学响应，并用于驱动超快光学开关，以产生无源Q开关激光脉冲，脉冲持续时间为910 ns（1.0μm）。非平衡合成策略为探索缺陷介导的物理化学和高性能非线性光学器件提供了可扩展的通用技术。

更新日期：2020-12-08

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