Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 8, Pages 7713-7719Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c01273
Keywords
Few-layer FePSe3 nanosheets; large modulation depth; controllable soliton pairs; harmonic mode locking
Funding
- National Natural Science Foundation of China [61605106]
- Shaanxi international cooperation project [2020KW-005]
- Funded Projects for the Acedemic Leader and Acedemic Backbones, Shaanxi Normal University [18QNGG006]
- Starting Grants of Shaanxi Normal University [1112010209, 1110010717]
- Fundamental Research Funds For the Central Universities [GK201802006]
- Open Research Fund of State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences [SKLST201809]
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Optical-intensity modulators based on two-dimensional (2D) materials play a significant role in the realization of ultrashort pulses. FePSe3, as a new 2D material, has shown great potential in this field because it has a suitable band gap (indirect, similar to 1.3 eV) and stronger linear absorption in the middle infrared region compared with homologous compounds. However, the research of its nonlinear absorption has not been reported yet. In this work, the saturable absorption intensity (312 MW/cm(2)) and modulation depth (33.7%) of few-layer FePSe3 nanosheets, synthesized by an inorganic salt templated method, have been measured by a stable femtosecond laser. Most importantly, controllable bright-dark soliton pairs in the time domain and 40th-order harmonic mode locking have been experimentally achieved based on an optical-intensity modulator made by few-layer FePSe3 nanosheets. This work has proven that few-layer FePSe3 nanosheets can be used as a high-performance optical-intensity modulator in many fields, such as ultrafast optics.
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