期刊
ACS NANO
卷 11, 期 5, 页码 4892-4898出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b01457
关键词
tungsten disulfide; second-harmonic generation (SHG); third-harmonic generation (THG); nonlinear optics; polarization; spiral structure
类别
资金
- National Natural Science Foundation of China [51672076, 11374092, 61474040, 61574054, 61505051]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Joint Research Fund for Overseas Chinese, Hong Kong and Macau Scholars of the National Natural Science Foundation of China [61528403]
- Foundation for Innovative Research Groups of NSFC [21521063]
Transition metal dichalcogenides (TMDs) have provided a fundamental stage to study light-matter interactions and optical applications at the atomic scale due to their ultrathin thickness and their appropriate band gap in the visible region. Here, we report the strong nonlinear optical effects, including second-harmonic generation (SHG) and third-harmonic generation (THG) in spiral WS2 structures. SHG intensity quadratically increases with layer numbers, other than diminishing the oscillation of 2H stacking TMDs. The contrary SHG behavior is attributed to the broken symmetry from twisted screw structures, revealed by aberration-corrected transmission electronic microscope observation. Furthermore, the twist angle 650 of the screw structure (5 degrees) was obtained by high-resolution transmission microscope measurements and confirmed by polarization tests of SHG output. Moreover, we roughly estimate the effective second-order nonlinear susceptibility. The discovery and understanding of the accumulation of nonlinear susceptibility of spiral structures with increasing thickness will extend the nonlinear applications of TMDs.
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