摘要
太赫兹波的产生与调控对太赫兹技术发展至关重要。超材料的可设计几何结构与特异共振响应为产生与调控太赫兹波提供了新的途径。但超材料产生太赫兹波辐射的转换效率较低仍然是一个亟待解决的问题。设计了一种由金属谐振环阵列和全介质硅开口谐振器组成的超材料。利用麦克斯韦方程联合表述电子运动的流体动力模型的自洽方程组,研究了该超材料的太赫兹波辐射与调控过程。研究发现,通过优化分裂谐振环的开口方向,超材料产生的太赫兹波振幅提高了1倍。此外,通过改变入射光偏振角及超材料的几何尺寸实现了太赫兹波振幅调控。这为基于超材料的,紧凑型和可调谐的太赫兹源提供了新途径。
The generation and manipulation of terahertz wave is crucial for the advancement of terahertz technology.The designable geometry and specific resonance response of metamaterials offer a novel approach for generating and manipulating terahertz waves.However,the low conversion efficiency of terahertz wave from metamaterials remains a challenging issue to be addressed.In this paper,a metamaterial was designed which consisted of metal resonator ring array and all-dielectric silicon split ring resonators.The terahertz wave radiation and manipulation of the metamaterial were studied by using self-consistent equations consisting of Maxwell's equation and the hydrodynamic model of the electron motion.It was discovered that by optimizing the opening direction of the split ring resonators,the amplitude of terahertz waves generated by the metamaterial was doubled.Furthermore,control over the amplitude of terahertz wave was achieved by altering both the polarization angle of incident light and the geometry of the metamaterial.This work opens up new possibilities for compact and tunable terahertz sources based on metamaterials.
作者
徐新龙
史明坚
黄媛媛
刘慧彪
熊永臻
XU Xinlong;SHI Mingjian;HUANG Yuanyuan;LIU Huibiao;XIONG Yongzhen(School of Physics,Northwest University,Xi'an 710127,China)
出处
《光学仪器》
2024年第3期1-8,17,共9页
Optical Instruments
基金
国家自然科学基金(12261141662,12374315)
西北大学2023研究生教育综合改革研究与实践项目(ZG2023009)。
关键词
超材料
太赫兹辐射
分裂谐振环
共振耦合效应
metamaterial
terahertz radiation
split ring resonators
resonance coupling effect
