Self-trapped exciton-phonon resonance enhanced nonlinear susceptibility in 2D KNbO2

被引：1
|
作者：
Zhou, Fei [1 ]
Yang, Zhiyuan [1 ]
Huang, Jingtao [2 ]
Zheng, Xueping [1 ]
Wei, Xianhua [1 ]
Dai, Bo [1 ]
机构：
[1] Southwest Univ Sci & Technol, Sch Mat & Chem, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2024年 / 125卷 / 22期
基金：
中国国家自然科学基金;
关键词：
2ND-HARMONIC GENERATION; SPECTROSCOPY; BAND;
D O I：
10.1063/5.0239364
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Strong second harmonic generation (SHG) was observed when the two-photon energy matches to the self-trapped exciton resonance states in the lattice inversion symmetric system of two-dimensional (2D) KNbO2 crystals. It is ascribed to the symmetry broken induced by the bending distortion of O-Nb-O in individual octahedrons (low frequency T(2g )modes) that coupling to the two-photon frequency. The quantum confinement SHG response with more than one orders of enhancement is obtained due to the phonon-exciton-photon interaction with dimension reduction. In addition, the exciton-phonon interaction couples SHG photons to a non-equilibrium energy with a Stokes or anti-Stokes energy splitting of similar to 18-21 meV, which is corresponding to the Raman shift of T-2g modes.
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页数：5
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