Ultraviolet second harmonic generation from Mie-resonant lithium niobate nanospheres

Nanophotonics

Xu Yi¹  Lan Sheng²  Xiang Jin³  Liu Wenjing⁴  Liu Jin⁵  Wang Jiayi⁵  Chen Bo⁵  Liu Zhuojun⁵  Wei Yuming⁵ 

[1] Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou510630, China;Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou510006, China;Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, School of Optoelectronic Engineering, Chongqing University, Chongqing400044, China;State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, 100871, Beijing, China;State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou510275, China;

关键词: lithium niobate;    mie resonance;    nanosphere;    second harmonic generation;   

DOI  :  10.1515/nanoph-2021-0326

来源: DOAJ

【 摘 要 】

Lithium niobate (LN), as a nonlinear material with a large nonlinear susceptibility, has been widely employed in second harmonic generation (SHG) up to ultraviolet (UV) frequency range due to its broad low-absorption window. In nanophotonics, it is possible to harness the Mie resonances associated with the single dielectric particles to boost the nonlinear light–matter interactions. Here, we fabricate single Mie-resonant LN nanospheres on a SiO2 substrate via the femtosecond (fs) laser ablation technique. By exploiting the magnetic dipole (MD) Mie resonance, UV SHG from the LN nanosphere is significantly enhanced with a measured conversion efficiency of 4.45 × 10−8 under the excitation of an fs laser at 750 nm. The single LN nanospheres achieved in this work could serve as Mie resonators for building nonlinear nanophotonic devices such as frequency converters and quantum light sources, etc.

【 授权许可】

Unknown