材料科学
非线性光学
光电子学
非线性光学
宽带
相位匹配
氧化物
铌
氧化铌
光学
非线性系统
纳米技术
激光器
物理
量子力学
冶金
作者
Wenduo Chen,Song Zhu,Ruihuan Duan,Chongwu Wang,Fakun Wang,Yao Wu,Mingjin Dai,Jieyuan Cui,Sang Hoon Chae,Zhipeng Li,Xuezhi Ma,Qian Wang,Zheng Liu,Qi Jie Wang,Qi Jie Wang,Qi Jie Wang
标识
DOI:10.1002/adma.202400858
摘要
Abstract 2D materials are burgeoning as promising candidates for investigating nonlinear optical effects due to high nonlinear susceptibilities, broadband optical response, and tunable nonlinearity. However, most 2D materials suffer from poor nonlinear conversion efficiencies, resulting from reduced light‐matter interactions and lack of phase matching at atomic thicknesses. Herein, a new 2D nonlinear material, niobium oxide dibromide (NbOBr 2 ) is reported, featuring strong and anisotropic optical nonlinearities with scalable nonlinear intensity. Furthermore, Fabry‐Pérot (F‐P) microcavities are constructed by coupling NbOBr 2 with air holes in silicon. Remarkable enhancement factors of ≈630 times in second harmonic generation (SHG) and 210 times in third harmonic generation (THG) are achieved on cavity at the resonance wavelength of 1500 nm. Notably, the cavity enhancement effect exhibits strong anisotropic feature tunable with pump wavelength, owing to the robust optical birefringence of NbOBr 2 . The ratio of the enhancement factor along the b – and c –axis of NbOBr 2 reaches 2.43 and 5.27 for SHG and THG at 1500 nm pump, respectively, which leads to an extraordinarily high SHG anisotropic ratio of 17.82 and a 10° rotation of THG polarization. The research presents a feasible and practical strategy for developing high‐efficiency and low‐power‐pumped on‐chip nonlinear optical devices with tunable anisotropy.
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