A group of researchers from Tohoku University, Massachusetts Institute of Technology (MIT), Rice University, Hanoi University of Science and Technology, Zhejiang University, and Oak Ridge National Laboratory have proposed a new mechanism to enhance short-wavelength light (100–300 nm) by second harmonic generation (SHG) in a two-dimensional (2D), thin material composed entirely of commonplace elements.
, Janus TMDs do not have inversion symmetry between two surfaces of thin material. This built-in asymmetry makes Janus-TMD materials suitable for SHG, particularly when the two TMDs are hetero-stacked.
SHG is a nonlinear optical process in which two photons with the same frequency interact nonlinearly with the material, and as a result, a single photon with twice the frequency is generated. Basically, it is a phenomenon where incoming light is converted into light with double the frequency or half wavelength.
SHG is important in various applications, including laser technology, microscopy, medical science and solid state physics. SHG is used to generate light with shorter wavelengths, which can be valuable in fields like semiconductor lithography equipment and"Our team of researchers optimized conditions of SHG in heterobilayers of the 2D Janus TMD materials," points out Nguyen Tuan Hung, assistant professor at the Frontier Institute for Interdisciplinary Science , Tohoku University.
"Thus, we have suggested that SHG intensity is also a useful way to determine how the layers of 2D materials are stacked," said Nguyen. In addition, the researchers suggest that adding lateral strain to these materials can further increase the light intensity significantly." "Our research introduces a new category of materials that produce SHG, and we can make them in a flexible way using 2D materials," adds Nguyen.Nguyen Tuan Hung et al, Nonlinear Optical Responses of Janus MoSSe/MoS2 Heterobilayers Optimized by Stacking Order and Strain,
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