通过控制晶格参数中的傅里叶谐波分量,在三阶Γ点合并连续体中的束缚态

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sun-Goo Lee , Seong-Han Kim , Wook-Jae Lee
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引用次数: 0

摘要

最近的研究表明,通过在动量空间中合并连续体中的多个束缚态(BICs),可以实现超高 Q 值共振,这种共振对制造缺陷很稳定。多个 BIC 的合并在实际应用中大有可为,它为获得超高 Q 值共振提供了一种稳健的方法,从而大大增强了光物质之间的相互作用。在这项研究中,我们引入了一种新方法,在一维漏模光子晶格中的第四止带边缘(在三阶Γ点处打开)实现 BIC 的合并。光子带隙和 BIC 产生于晶格参数的周期性调制。然而,在三阶 Γ 点附近,平面外辐射是由晶格参数中的第一和第二次傅里叶谐波分量引起的。在这两个傅里叶谐波分量之间存在最佳平衡的特定 k 点,会出现意外 BIC。我们证明,这些意外 BIC 在拓扑上是稳定的,而且它们在动量空间中的位置可以通过调整影响第一和第二傅里叶谐波分量强度的特定晶格参数来精确控制。此外,我们还证明,在保持其他参数不变的情况下,通过微调这个特定的晶格参数,可以在三阶 Γ 点合并意外 BIC,无论是否存在对称保护 BIC。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Merging bound states in the continuum at third-order Γ point enabled by controlling Fourier harmonic components in lattice parameters
Recent studies have demonstrated that ultrahigh-Q resonances, which are robust to fabrication imperfections, can be realized by merging multiple bound states in the continuum (BICs) in momentum space. The merging of multiple BICs holds significant promise for practical applications, providing a robust means to attain ultrahigh-Q resonances that greatly enhance light–matter interactions. In this study, we introduce a novel approach to achieve the merging of BICs at the edges of the fourth stop band, which opens at the third-order Γ point, in one-dimensional leaky-mode photonic lattices. Photonic band gaps and BICs arise from periodic modulations in lattice parameters. However, near the third-order Γ point, out-of-plane radiation arises by the first and second Fourier harmonic components in the lattice parameters. Accidental BICs can emerge at specific k points where an optimal balance exists between these two Fourier harmonic components. We demonstrate that these accidental BICs are topologically stable, and their positions in momentum space can be precisely controlled by adjusting a specific lattice parameter that influences the strength of the first and second Fourier harmonic components. Furthermore, we show that accidental BICs can be merged at the third-order Γ point, with or without a symmetry-protected BIC, by finely adjusting this specific lattice parameter while keeping other parameters constant.
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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