Wang Jun, research group of Shanghai Institute of Optics and mechanics, Chinese Academy of Sciences, has made a series of progress in the study of two-dimensional nano materials' phototransparency

Recently, the research group of Wang Jun, a researcher in the Key Laboratory of high power laser materials, Shanghai Institute of Optics and mechanics, Chinese Academy of Sciences, has made many progress in the study of two-dimensional nano materials' photoinduced transparency Electromagnetically induced transparency (EIT) can be used to control window transparency through light in atomic system, which has important application value in all-optical processing and quantum information processing At the same time, photoinduced transparency is also a very important nonlinear optical effect, especially in the optical devices such as light modulator, all-optical switch and so on However, there are few reports on the phototransparency of transition metal sulfide, black phosphorus and other important two-dimensional nano materials, which limits the development of devices based on such materials to some extent The research team used liquid phase stripping technology to prepare MoS 2, mose 2, graphene and other two-dimensional nano material suspensions, and observed the phenomenon of phototransparency and extinction It is found that 632.8 nm continuous probe light can be effectively modulated into peak (photo transparent) and valley (photo extinction) by 532 nm nanosecond pump laser through the interaction of saturated absorption and nonlinear scattering mechanism The researchers systematically studied the optical modulation characteristics under different pump conditions, with the maximum modulation depth up to 7 dB This work can help to develop application devices of optical modulation and all-optical switch based on two-dimensional semiconductor The research results were published in advanced optical materials (DOI: 10.1002/atom.201700543) The research team of all-optical modulation process (source: Shanghai Institute of Optics and mechanics, Chinese Academy of Sciences) has studied the nonlinear optical response dependence characteristics of wavelength and excitation pulse width of the liquid suspension black phosphorus system, and found that the liquid suspension black phosphorus nano film has better nonlinear saturated absorption response in the visible light region than in the near-infrared region, and the nonlinear absorption coefficient is larger under the excitation of long pulse width In this paper, the phenomenon of optical transparency and optical limiting induced by nonlinear optical scattering due to the saturated absorption property of the suspended black phosphorus Nanoflake is reported, and its generation process is explained, which is of great significance for the device of new materials The research results were published in ACS Photonics (DOI: 10.1021 / acsphotonics 7b00598) The research group of saturated absorption property, nonlinear absorption and nonlinear scattering induced phototransparency and optical limiting phenomenon of suspension black phosphorus (source: Shanghai Institute of Optics and mechanics, Chinese Academy of Sciences) and Professor Sun Zhenyu of Beijing University of chemical technology made a study on inhibiting the degradation rate of black phosphorus by polymer coating, and prepared a large number of high-quality crystalline single-layer black phosphorus nano films The study of nonlinear optical properties shows that BP dispersion has saturated absorption characteristics at 515 and 1030 nm, and it has potential application in ultra fast broadband absorber The work was published in chemistry of materials (DOI: 10.1021/acs.chemmater.7b01991) The research group of high stability black phosphorus suspension (source: Shanghai Institute of Optics and mechanics, Chinese Academy of Sciences) and Chen Yu, Professor of East China University of science and technology, designed and synthesized polyacrylonitrile (Pan) covalently modified MoS 2 Nano tablets (J mater Chem C, DOI: 10.1039 / c7tc03900j) and BP: C60 composite materials (chem Commin., DOI: 10.1039/c7cc07937k) The optical limiting properties of these composites under the action of nanosecond pulse in the visible near infrared band are systematically studied It is found that the optical limiting properties of these composites are significantly improved compared with the intrinsic materials, which is of great significance for the development of optical limiting devices based on these composite nanomaterials Optical limiting properties of two-dimensional nanocomposites (source: Shanghai Institute of Optics and mechanics, Chinese Academy of Sciences) paper link: https://doi.org/10.1002/atom.201700543 http://pubs.acs.org/doi/10.1021/acsphotonics.7b00598 http://pubs.acs.org/doi/abs/10.1021/acs.chemometer.7b01991 http://pubs.rsc.org/en/content/articlelanding/2017/tc/c7tc03900j Http://pubs.rsc.org/en/content/article landing/2018/cc/c7cc07937kා! Introduction of researcher Wang Jun of divabstract http://www.siom.cas.cn/jgsz/qch/qch_hyxx / 201707 / t20170727_.html