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journal article·2023-06Open access

Polarization‐Independent Second Harmonic Generation in 2D Van Der Waals Kagome Nb3SeI7 Crystals

Yuqiang Fang, Xin Feng, Dong Wang, Yang Ding, Tianquan Lin, Tianyou Zhai, Fuqiang Huang

Small· Volume 19· Issue 26
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Source abstract

Abstract

Abstract Second harmonic generation (SHG) of 2D crystals has been of great interest due to its advantages of phase‐matching and easy integration into nanophotonic devices. However, the polarization‐dependence character of the SHG signal makes it highly troublesome but necessary to match the laser polarization orientation relative to the crystal, thus achieving the maximum polarized SHG intensity. Here, it is demonstrated a polarization‐independent SHG, for the first time, in the van der Waals Nb3SeI7 crystals with a breathing Kagome lattice. The Nb3 triangular clusters and Janus‐structure of each Nb3SeI7 layer are confirmed by the STEM. Nb3SeI7 flake shows a strong SHG response due to its noncentrosymmetric crystal structure. More interestingly, the SHG signals of Nb3SeI7 are independent of the polarization of the excitation light owing to the in‐plane isotropic arrangement of nonlinear active units. This work provides the first layered nonlinear optical crystal with the polarization‐independent SHG effect, providing new possibilities for nonlinear optics.
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Research context

Nanomaterials

OpenAlex topics: Advanced Fiber Laser Technologies · Photonic and Optical Devices · Photorefractive and Nonlinear Optics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of High‐Performance Ceramics and Super fine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P. R. China

State Key Laboratory of Material Processing and Die & Mold Technology School of Materials Science and Technology Huazhong University of Science and Technology Wuhan 430074 P. R. China

Center for High‐Pressure Science and Technology Advanced Research Beijing 100094 P. R. China

School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China

State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China

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