石墨烯-金属杂化超材料中圆二色性的主动控制由连续体中的对称保护束缚态驱动。

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL Physical Chemistry Chemical Physics Pub Date : 2023-10-26 DOI:10.1039/D3CP03288D
Tian Ma, Wei Sang, Jiangkun Tian, Lingyun Ma, Li Ma and Jun Li
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引用次数: 0

摘要

等离子体超材料中手性的主动控制具有重要意义,因为它们在成像、通信和光谱学中具有不同的应用潜力。最近,受连续体束缚态(BIC)概念的启发,通过引入结构不对称性,在超材料中构建了强驰光学响应。然而,这些手性超材料大多是静态的,不能进行调制。在此,我们从理论上证明了一种在石墨烯-金属杂化超材料中操纵具有增强的圆二色性(CD)和大调制深度的手性响应的新方法。通过引入结构石墨烯并调节费米能(EF),成功地实现了BIC态和准BIC态之间的转换。当EF从0.01eV调节到1.0eV时,所提出的器件表现出在0.693-0.008范围内的可调谐CD,这可以通过优化其几何形状来进一步改进。所提出的石墨烯-金属杂化超材料为操纵太赫兹频率下的偏振态开辟了一条新途径,在动态显示和光电调制等实际应用中具有巨大潜力。
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Active control of circular dichroism in a graphene–metal hybridized metamaterial driven by symmetry-protected bound states in the continuum

Active control of chirality in plasmonic metamaterials is of great importance due to their potential for diverse applications in imaging, communication and spectroscopy. Recently, inspired by the concept of bound states in the continuum (BIC), strong chiroptical responses are constructed in metamaterials by introducing structural asymmetries. However, most of these chiral metamaterials are static and cannot be modulated. Herein, we theoretically demonstrate a novel approach for manipulating chiroptical responses with enhanced circular dichroism (CD) and large modulation depths in a graphene–metal hybridized metamaterial. By introducing a structured graphene and adjusting the Fermi energy (EF), the conversion between BIC and quasi-BIC states is achieved successfully. The proposed device demonstrates a tuneable CD in the range of 0.693–0.008 when EF is adjusted from 0.01 eV to 1.0 eV, which can be further improved by optimizing its geometry. The proposed graphene–metal hybridized metamaterial paves a new way for manipulating polarization states at terahertz frequencies and is of great potential for practical applications such as dynamic display and optoelectronic modulation.

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来源期刊
Physical Chemistry Chemical Physics
Physical Chemistry Chemical Physics 化学-物理:原子、分子和化学物理
CiteScore
5.50
自引率
9.10%
发文量
2675
审稿时长
2.0 months
期刊介绍: Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.
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