Substrate-Modulated Electric and Magnetic Resonances of Lithium Niobite Nanoparticles Illuminated by White Light

Abstract

The manipulation of light at the nanoscale is important for nanophotonic research. Lithium niobite (LiNbO3), 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 LiNbO3 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 LiNbO3 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 LiNbO3 nanoparticle, and the thickness of the SiO2 film between the particle and the Au film have a significant impact on the electromagnetic resonance of the LiNbO3 nanoparticle. This work provides a new insight into LiNbO3 nanoparticles, which may have potential use in the design of dielectric nanomaterials and devices.

Strong Plasmon-Mie Resonance in Si@Pd Core-Ω Shell Nanocavity

“…For example, the resonant mode of metal nanoshell is coupled with the Mie resonance of the Si [ 26 ] and CdS [ 27 ] nanowires to concept the tunable nanoscale light source. The metal substrate affects the coupling of the hybrid system [ 28 ]. Further, the dielectric NS on metal film is constructed, and LSPR [ 29 ] is excited at the nanogap between dielectric NS and metal substrate.…”