基于双准偶然连续体束缚态模式的传感与慢光研究
Investigation of Sensing and Slow-Light Based on Dual Accidental Quasi-Bound States in the Continuum
陈莎 1刘钦柯 1李燕 2周尧杰 1陆振东 1罗晓清 1王新林3
作者信息
- 1. 南华大学电气工程学院,湖南 衡阳 421001
- 2. 南华大学核科学技术学院,湖南 衡阳 421001
- 3. 南华大学电气工程学院,湖南 衡阳 421001;南华大学机械工程学院超快微纳技术与激光先进制造湖南省重点实验室,湖南 衡阳 421001
- 折叠
摘要
近年来,光学超表面中的连续体束缚态(BIC)因其独特的性质而受到了广泛的关注.为了研究两个准偶然连续体束缚态(A-QBIC)模式之间相互作用诱导的新颖光学现象,提出一种方形纳米孔阵列全介质超表面.结果表明,在x偏振光和y偏振光入射时能实现A-BIC现象,尤其在45°偏振光入射下可实现两个A-QBIC模式间的相互作用.利用能带理论和多极展开理论对A-QBIC模式进行分析,发现这两种模式均由环形偶极模式主导.重要的是,基于A-QBIC模式的高Q值特性,能够构建高灵敏度折射率传感,同时利用两个A-QBIC模式间具有灵活调谐度的相互作用特性,还能够实现类电磁诱导透明和可调的慢光.研究结果可为基于A-QBIC的高Q超构器件在高灵敏度折射率传感及慢光等领域的应用提供理论参考.
Abstract
In recent years,bound states in the continuum(BIC)in optical metasurfaces have garnered significant attention owing to their unique properties.Because of the interaction of two accidental quasi-bound states in the continuum(A-QBIC)modes,we explore the related novel optical phenomena in an all-dielectric metasurface that comprises a square nano-aperture array.It is shown that the A-BIC phenomenon can occur under x-and y-polarized normal incidences but exhibits the interaction of the two A-QBIC modes under 45° polarized incidence.The A-QBIC modes,which are analyzed using band and multipole expansion theories,are primarily governed by the toroidal dipole.Notably,the high Q-factor of the A-QBIC modes not only allows for the implementation of highly sensitive refractive index sensing but also facilitates the realization of flexible tunability of the interaction between the two A-QBIC modes,thereby achieving an analogue of electromagnetically induced transparency and tunable slow-light.Our results provide a feasible strategy to develop a high Q-factor meta-device based on A-QBIC in highly sensitive refractive index sensing and slow-light applications.
关键词
全介质超表面/连续体束缚态/准偶然连续体束缚态/折射率传感/慢光Key words
all-dielectric metasurface/bound states in the continuum/accidental quasi-bound states in the continuum/refraction index sensing/slow-light引用本文复制引用
出版年
2024
NETL
NSTL
万方数据