Ultrasensitive Frequency Shifting of Dielectric Mie Resonance near Metallic Substrate.

ABSTRACT: Dielectric resonators on metallic surface can enhance far-field scattering and boost near-field response having promising applications in nonlinear optics and reflection-type devices. However, the dependence of gap size between dielectric resonator and metallic surface on Mie resonant frequency is complex and desires a comprehensive physical interpretation. Here, we systematically study the effect of metallic substrate on the magnetic dipole (MD) resonant frequency at X-band by placing a high permittivity CaTiO₃ ceramic block on metallic substrate and regulating their gap size. The simulated and experimental results show that there are two physical mechanisms to codetermine the metallic substrate-induced MD frequency. The greatly enhanced electric field pair in the gap and the c

SUBMITTER: Liu C 

PROVIDER: S-EPMC9115667 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature