Ultraviolet second harmonic generation from Mie-resonant lithium niobate nanospheres
Wang Jiayi,
Liu Zhuojun,
Xiang Jin,
Chen Bo,
Wei Yuming,
Liu Wenjing,
Xu Yi,
Lan Sheng,
Liu Jin
Affiliations
Wang Jiayi
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou510275, China
Liu Zhuojun
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou510275, China
Xiang Jin
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, School of Optoelectronic Engineering, Chongqing University, Chongqing400044, China
Chen Bo
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou510275, China
Wei Yuming
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou510275, China
Liu Wenjing
State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, 100871, Beijing, China
Xu Yi
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou510630, China
Lan Sheng
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou510006, China
Liu Jin
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou510275, China
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.
