Nonreciprocal transmission based on quasi-bound states in the continuum via scaled lattice constants

IF 6.6 2区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Ran Li, Junqiang Sun
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Abstract

Nonreciprocal devices are key technologies for modern photonic applications, and nonlinearly induced nonreciprocity based on metasurface platforms opens up the potential for compactness and miniaturization of such devices in free-space optical paths. In this work, a design of quasi-bound states in the continuum (QBICs) via scaled lattice constants is employed, featuring a plate-hole tetramer unit cell with single-step etching. Under normal incidence, QBICs exhibit polarization-insensitive excitation, with the scattering dominated by the combination term of magnetic dipoles, magnetic toroidal dipoles, electric quadrupoles as well as electric toroidal quadrupoles – rendering the vertical field distribution sensitive to parametric variations. Embedding Kerr nonlinearity yields nonreciprocal responses under upper and lower port excitation. The steep edges between peaks and valleys in the Fano-line-shaped transmission spectra facilitate balancing the nonreciprocal intensity range (NRIR) and isolation. The NRIR originates from electromagnetic asymmetry introduced by varying the substrate refractive index and can be flexibly tuned via structural parameters – validated by simulations of nonreciprocal responses with varying plate thickness alone. Additionally, Rabi splitting from varying hole depth induces abrupt electromagnetic asymmetry changes in the strong coupling region, offering a new NRIR tuning freedom. This design strategy provides fresh insights for nonreciprocal device research, with the structure holding promise for sensing and nonlinear applications.
基于标度晶格常数的准束缚态的非互易传输
非互易器件是现代光子应用的关键技术,基于超表面平台的非线性诱导非互易器件为自由空间光路中此类器件的紧凑化和小型化开辟了潜力。在这项工作中,采用了一种通过缩放晶格常数来设计连续介质中的准束缚态(qbic),具有单步蚀刻的板孔四聚体单元电池。正入射下,qbic表现为极化不敏感激发,散射以磁偶极子、磁环偶极子、电四极子和电环四极子的组合项为主,使得垂直场分布对参数变化敏感。嵌入克尔非线性在上下端口激励下产生非互反响应。法诺线型透射光谱峰谷之间的陡峭边缘有助于平衡非互易强度范围(NRIR)和隔离。NRIR源于基片折射率变化引起的电磁不对称,可以通过结构参数灵活地调谐-通过单独改变板厚的非互反响应模拟验证。此外,由不同孔深引起的Rabi分裂在强耦合区引起突然的电磁不对称性变化,提供了新的NRIR调谐自由度。这种设计策略为非互易器件的研究提供了新的见解,该结构有望用于传感和非线性应用。
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来源期刊
Nanophotonics
Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
13.50
自引率
6.70%
发文量
358
审稿时长
7 weeks
期刊介绍: Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.
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