Abstract
Abstract
Enhancing nonlinear frequency conversions at ultraviolet (UV) frequencies holds immense significance in contemporary physics and nanophotonics. In this work, we have theoretically demonstrated a highly efficient UV second-harmonic generation (SHG) in the Al nanorod−LiNbO3 (LN)−Al film nanostructure by two orders of magnitude higher compared to the conventional LiNbO3 nanostructure in this range. This result is acquired by designing a simple Al nanoparticle-Al film plasmonic system that generates magnetic resonances at near-UV frequencies to confine light to the LN, which can highly enhance the electromagnetic field and lead to strong interactions with the large nonlinear susceptibility. Our research provides profound insights into the pivotal role of plasmon-induced magnetic resonance (PIMR) modes in UV-SHG processes, thereby opening up new avenues for the development of nanoscale UV nanosources and nonlinear metasurface applications at subwavelength scale.
Funder
Educational Research Project for Young and Middle-aged Teachers in Fujian Province
Doctoral Research Initiation Fund of Zhangzhou Institute of Technology
Research Innovation Team Fund of Zhangzhou Institute of Technology
Fundamental Research Program in Shanxi Province