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.

引用

页数：5

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