Toroidal dipole bound states in the continuum in asymmetric dimer metasurfaces

多极展开 偶极子 四极 二聚体 物理 光子晶体 凝聚态物理 束缚态 Q系数 布里渊区 光学 量子力学 原子物理学 核磁共振 谐振器
作者
Haozong Zhong,Lujun Huang,Shuangli Li,Chaobiao Zhou,Shaojun You,Lin Li,Ya Cheng,Andrey E. Miroshnichenko
出处
期刊:Applied physics reviews [American Institute of Physics]
卷期号:11 (3) 被引量:29
标识
DOI:10.1063/5.0200778
摘要

Structural symmetry plays a pivotal role in the emergence of symmetry-protected bound states in the continuum (BICs), often observed at the Γ-point within the first Brillouin zone. However, structural symmetry is not an absolute requirement for the formation of BICs at the Γ-point. In this work, we demonstrate that all-dielectric metasurfaces and photonic crystal slabs, made of dimer nanostructures with different sizes and shapes, can sustain BICs at the Γ-point. We show that the nature of these BICs is well preserved, irrespective of the size mismatch/difference, as long as the center-to-center distance between two nanodisks is equal to half of the lattice constants of a superunit cell. The BICs are transformed into quasi-BICs (QBICs) with finite quality (Q) factors by varying the interspacing of dimer nanodisks. Multipole decomposition indicates that this BIC is primarily governed by a toroidal dipole, with a secondary contribution from a magnetic dipole and magnetic quadrupole. Furthermore, we establish that such a BIC is robust against the shape of nanodisks. Notably, we observe that the Q-factor of QBICs for right nanodisks displaced along the y-axis is three orders of magnitude higher than those along the x-axis, suggesting an effective approach to realizing ultrahigh-Q resonances. Finally, we present an experimental demonstration of such a BIC by fabricating silicon dimer metasurfaces and photonic crystal slabs with dimer nanoholes. The trend of measured Q-factors and resonant wavelengths of QBICs shows good agreement with theoretical predictions. The maximum Q-factor is up to 22 633. These results not only advance our understanding of BICs within compound metasurfaces but also hold great promise in enhancing light–matter interactions.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
1秒前
1秒前
fish1116发布了新的文献求助100
1秒前
1秒前
bbbbb沫完成签到,获得积分20
1秒前
峥2发布了新的文献求助10
1秒前
wzy完成签到,获得积分10
1秒前
xxxllllll发布了新的文献求助10
2秒前
干净映天完成签到 ,获得积分10
2秒前
LJ_scholar发布了新的文献求助10
3秒前
kuny完成签到,获得积分10
3秒前
勤恳的夏之完成签到,获得积分20
4秒前
wzy发布了新的文献求助10
4秒前
钵钵鸡完成签到 ,获得积分10
4秒前
JING发布了新的文献求助10
4秒前
後zgw完成签到,获得积分10
6秒前
6秒前
7秒前
明朗发布了新的文献求助10
7秒前
meredith0571完成签到,获得积分10
8秒前
8秒前
嗯哼发布了新的文献求助30
8秒前
lucky完成签到 ,获得积分10
8秒前
朴实山彤完成签到,获得积分20
9秒前
9秒前
bkagyin应助ccalvintan采纳,获得10
11秒前
Gpu_broken应助橙子采纳,获得20
11秒前
雪碧发布了新的文献求助10
11秒前
焦糖发布了新的文献求助10
12秒前
12秒前
12秒前
14秒前
14秒前
qqq完成签到,获得积分10
14秒前
jjjdcjcj完成签到,获得积分10
15秒前
打打应助mmol采纳,获得10
15秒前
15秒前
孙燕应助mariawang采纳,获得10
16秒前
所所应助冰之采纳,获得10
16秒前
LJ_scholar完成签到,获得积分10
17秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988732
求助须知:如何正确求助?哪些是违规求助? 3531027
关于积分的说明 11252281
捐赠科研通 3269732
什么是DOI,文献DOI怎么找? 1804764
邀请新用户注册赠送积分活动 881869
科研通“疑难数据库(出版商)”最低求助积分说明 809021