Highly Defective Nanocrystals as Ultrafast Optical Switches: Nonequilibrium Synthesis and Efficient Nonlinear Optical Response
- Xiaowen ZhangXiaowen ZhangState Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaGuangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, ChinaGuangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, ChinaMore by Xiaowen Zhang,
- Duoduo ZhangDuoduo ZhangSchool of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaMore by Duoduo Zhang,
- Dezhi Tan* ,
- Yuehui XianYuehui XianSchool of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaMore by Yuehui Xian,
- Xiaofeng Liu* , and
- Jianrong Qiu*Jianrong Qiu*Email: [email protected]State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaCAS Center for Excellence in Ultra-Intense Laser Science, Chinese Academy of Sciences, Shanghai 201800, ChinaMore by Jianrong Qiu
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.
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