journal article·2020-04-14

Photochemically Derived Plasmonic Semiconductor Nanocrystals as an Optical Switch for Ultrafast Photonics

Xiaowen Zhang, Simin Liu, Dezhi Tan, Yuehui Xian, Duoduo Zhang, Zuxing Zhang, Yi Liu, Xiaofeng Liu, Jianrong Qiu

Chemistry of Materials· Volume 32· Issue 7
Publisher page

Abstract

Establishing a new photonic material with large optical nonlinearity in the near-infrared regime is significant for ultrafast optical science and devices. In this paper, we developed a facile photochemical approach to fabricate covellite CuS plasmonic nanocrystals (NCs) with high chemical stability and strong oxidation resistance under ambient conditions. The photochemically derived CuS NCs possess strong absorption in the visible-to-near-infrared optical range caused by the localized surface plasmon resonance effect (LSPR). We further demonstrate superior saturable absorption behavior of CuS NCs with a large modulation depth and a high damage threshold. Using CuS as an optical switch, a highly stable mode-locked pulsed laser operating in the telecommunication band with a signal-to-noise ratio over 70 dB and a pulse duration of 1.57 ps has been achieved. Our results suggest that the photochemical method is an effective technique to fabricate plasmonic NCs, which can be developed as an excellent candidate for ultrafast photonic devices in the visible-to-near-infrared region.
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Research context

OpenAlex topics: Advanced Fiber Laser Technologies · Nonlinear Optical Materials Studies · Laser-Matter Interactions and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China

Advanced Photonics Technology Lab, College of Electronics and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

CAS Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai 201800, China

Funding

Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · State Key Laboratory of Precision Spectroscopy · State Key Laboratory of High Field Laser Physics · National Natural Science Foundation of China · State Key Laboratory of High Performance Ceramics and Superfine Microstructure · Wuhan Optoelectronic National Research Center, Huazhong University of Science and Technology · Shanghai Institute of Ceramics, Chinese Academy of Sciences

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