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Left: High-resolution transmission electron micrograph of molybdenum disulfide; Right: Comparison of Z scan results of molybdenum disulfide and graphene dispersion
Recently, Professor Wang Jun, Key Laboratory of High-power Laser Materials, Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences and its collaborators (Zhang Long, Researcher of Key Laboratory of Laser Materials, Zhao Quanzhong, State Key Laboratory of Laser Field Physics, and Shanghai Institute of Optics and Fine Mechanics Prof. Werner Blau, Professor of Foreign Experts, Chinese Academy of Sciences, etc.) Presented an original research paper entitled Ultrafast Saturable Absorption of Two-Dimensional MoS2 Nanosheets in the international academic journal ACS Nano. It was reported for the first time that the two-dimensional layered MoS2 nanomaterials are excellent in the near infrared region. Ultra-fast saturation absorption.
Under the promotion of graphene research, two-dimensional nanomaterials of transition metal sulfides, such as MoS2, MoSe2, MoTe2, and WS2, are highly valued, and many unique photoelectric properties are manifested after the material is degraded from a bulk material to a two-dimensional monolayer. This kind of material has become one of the core materials for the international frontier research of a new generation of high-performance nano-optoelectronic devices. However, there are few reports about the ultra-fast nonlinear optical properties and corresponding photonic devices for such wide band gap direct-gap semiconductor two-dimensional nanosheets.
The development of high-performance photonic devices is one of the cores of the development of contemporary optical information technology. Many photonics devices require materials with excellent ultra-fast nonlinear photonic properties as their core working materials. Therefore, the comprehensive and profound research on ultra-fast nonlinear photonic properties of potential optical functional materials is an indispensable link in the field of photonics, and is one of the driving forces behind the development of photonic information devices and technologies.
The team used liquid phase stripping technology to successfully prepare high-quality MoS2 nanosheet dispersions. Transmission electron microscopy, visible-infrared absorption spectroscopy, Raman spectroscopy, and atomic force microscopy studies show that there are a large number of high-quality MoS2 nanosheets in the dispersion. The ultra-fast nonlinear optical experiments confirmed that the MoS2 nanosheets exhibited superior saturation absorption response to graphene than 100 fs and 800 nm near-infrared laser pulses (see the attached figure).
These results indicate that the transition metal sulfide two-dimensional nanosemiconductor materials represented by MoS2 have great potential in the development of photonic devices such as ultrashort pulse mode locks, laser protection optical limiters, and optical switches. At present, there is no report on the ultra-fast nonlinear optical properties and corresponding photonic devices for such wide band gap direct-gap semiconductor two-dimensional nanosheets. This achievement was received from the invited report of Laser Optics 2012, the famous international conference on lasers in Russia, and from the prize-winning Graphene 2012 International Conference held in Brussels, Belgium (almost 200 applicants from around the world supported only 20).
The study was supported by the "Hundred Talents Program" of the Chinese Academy of Sciences, the National Natural Science Foundation, the Nano Special Project of the Shanghai Municipal Science and Technology Commission, the "Pujiang Talents" Program of Shanghai, and the "Outstanding Discipline Leader Program" of Shanghai.
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