Two-dimensional(2D)transition metal dichalcogenides(TMDs)attain increasing attention due to their exceptional nonlinear optical efficiencies,which hold promising potential for on-chip photonics and advanced optoelectr...Two-dimensional(2D)transition metal dichalcogenides(TMDs)attain increasing attention due to their exceptional nonlinear optical efficiencies,which hold promising potential for on-chip photonics and advanced optoelectronic applications.Planar TMDs have been proven to support orders-higher third-order nonlinear coefficients in comparison with common nonlinear materials.Interestingly,stronger light–matter interaction could be motivated when curved features are introduced to 2D TMDs.Here,a type of inorganic fullerene-like WS_(2) nanoparticles is chemically synthesized using hard mesoporous silica.By using the spatial self-phase modulation(SSPM)method,the nonlinear refractive index n_(2) and third-order susceptibility χ^((3))are investigated in the visible range.It is found that n_(2)∼10^(−5) cm^(2)∕W andχ^((3))∼10^(−7) esu,two orders higher than the counterparts of planar WS_(2) structures.Our experimental findings provide a fresh thinking in designing nonlinear optical materials and endow TMDs with new potentials in photonic integration applications.展开更多
基金Fundamental Research Funds for the Central Universities(Z201805196)Natural Science Foundation of Shaanxi Province(2018JM6001)Young Talent Recruiting Plans of Xi’an Jiaotong University.
文摘Two-dimensional(2D)transition metal dichalcogenides(TMDs)attain increasing attention due to their exceptional nonlinear optical efficiencies,which hold promising potential for on-chip photonics and advanced optoelectronic applications.Planar TMDs have been proven to support orders-higher third-order nonlinear coefficients in comparison with common nonlinear materials.Interestingly,stronger light–matter interaction could be motivated when curved features are introduced to 2D TMDs.Here,a type of inorganic fullerene-like WS_(2) nanoparticles is chemically synthesized using hard mesoporous silica.By using the spatial self-phase modulation(SSPM)method,the nonlinear refractive index n_(2) and third-order susceptibility χ^((3))are investigated in the visible range.It is found that n_(2)∼10^(−5) cm^(2)∕W andχ^((3))∼10^(−7) esu,two orders higher than the counterparts of planar WS_(2) structures.Our experimental findings provide a fresh thinking in designing nonlinear optical materials and endow TMDs with new potentials in photonic integration applications.
