Li Hui, Peng Yigeng, Lu Ruifeng
Institute of Ultrafast Optical Physics, Department of Applied Physics & MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China.
Nanomaterials (Basel). 2022 Jun 10;12(12):2010. doi: 10.3390/nano12122010.
The manipulation of light at the nanoscale is important for nanophotonic research. Lithium niobite (LiNbO), as an ideal building block for metamaterials, has attracted great interest for its unique properties in the field of nonlinear optics. In this paper, we numerically studied the effect of different substrates on the optical resonances of a LiNbO nanoparticle. The results show that the electric and magnetic resonances of such a system can be effectively adjusted by changing the substrate. Compared to the impact of dielectric substrate, the interaction between the LiNbO nanoparticle and the Au film shows a fascinating phenomenon that a sharp resonance peak appears. The multipole decomposition of the scattering spectrum shows that the size, shape of the LiNbO nanoparticle, and the thickness of the SiO film between the particle and the Au film have a significant impact on the electromagnetic resonance of the LiNbO nanoparticle. This work provides a new insight into LiNbO nanoparticles, which may have potential use in the design of dielectric nanomaterials and devices.
纳米尺度下的光操控对于纳米光子学研究至关重要。铌酸锂（LiNbO）作为超材料的理想构建单元，因其在非线性光学领域的独特性质而备受关注。在本文中，我们通过数值模拟研究了不同衬底对铌酸锂纳米颗粒光学共振的影响。结果表明，通过改变衬底可以有效调节该系统的电共振和磁共振。与介电衬底的影响相比，铌酸锂纳米颗粒与金膜之间的相互作用呈现出一个有趣的现象，即出现了一个尖锐的共振峰。散射光谱的多极分解表明，铌酸锂纳米颗粒的尺寸、形状以及颗粒与金膜之间SiO膜的厚度对铌酸锂纳米颗粒的电磁共振有显著影响。这项工作为铌酸锂纳米颗粒提供了新的见解，其在介电纳米材料和器件的设计中可能具有潜在应用。
