太赫兹全金属超构表面的极化无关准BICs研究
Polarization-independent quasi-Bound states In the Continuum based on terahertz all metal metasurfaces
赵正韬 1张亚倩 2肖中银 1刘德君2
作者信息
- 1. 上海大学 通信与信息工程学院,上海 200444
- 2. 上海师范大学 数理学院,上海 200234
- 折叠
摘要
提出一种具有高Q值的太赫兹全金属超构表面.该超构表面由4个菱形孔组成,改变相邻菱形孔的尺寸,可以打破结构的对称性,产生准连续域束缚态(BICs);改变入射波的极化角度,激发的准BICs频率保持不变,超构表面具有极化不相关特性.优化结构参数,仿真结果表明,当尺寸偏差为3 μm时,产生的准BICs实现了小于1 GHz的超窄带宽,对应Q值大于1 300.实验测试结果显示,加工的样品(偏差30 μm)测试Q值为40.相比于圆孔结构,菱形孔结构由于尖锐的转角可以实现较强的束缚场.本文提出的具有极化无关准BICs的超构表面在实时化学和生物分子传感中具有巨大的实际应用潜力.
Abstract
A terahertz(THz)all-metal metasurface with a high Q-factor has been proposed,consisting of four diamond-shaped holes.By altering the size of adjacent diamond-shaped holes,the symmetry of the structure can be broken,resulting in quasi-Bound states In the Continuum(BICs).By changing the polarization angle of the incident wave,the frequency of the excited quasi-BICs remains unchanged,exhibiting polarization-independent characteristics.Simulation results show that,by optimizing structural parameters,when the size deviation is 3 μm,the quasi-BICs achieved an ultra-narrow bandwidth of less than 1 GHz,corresponding to a Q-factor greater than 1 300.Experimental test results show that the fabricated sample(with a deviation of 30 μm)had a measured Q-factor of 40.Compared to circular hole structures,the diamond-shaped hole structure can achieve stronger bound fields due to its sharp corners.The proposed metasurface with polarization-independent quasi-BICs has enormous practical application potential in real-time chemical and biomolecular sensing.
关键词
太赫兹/超构表面/全金属/极化无关/连续域束缚态Key words
terahertz/metasurfaces/all-metal/polarization-independent/Bound states In the Continuum引用本文复制引用
基金项目
国家自然科学基金资助项目(62205211)
上海浦江人才资助项目(20PJ1412200)
出版年
2024
国家科技期刊平台
NSTL
万方数据