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arXiv 1803.05151physics.optics
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强共振周期结构上连续介质中的束缚态

Bound states in the continuum on periodic structures surrounded by strong resonances

Lijun Yuan, Ya Yan Lu

摘要:

束缚态在连续谱(BIC)是捕获或引导模式,其频率在辐射模式的频率间隔。在周期结构上,BIC被一族谐振模所包围,其品质因数接近无穷大。通常,品质因数与$1/|β- β_*|^2$成比例,其中$β$和$β_*$分别是谐振模式和BIC的布洛赫波矢量。但对于某些特殊的BIC,品质因数与$1/|β-β_*|^4$成正比。本文给出了二维周期结构上这类特殊BIC存在的一般条件。作为一个数值例子,我们使用的一般条件来计算特殊的BIC,这是反对称的驻波,在一个周期阵列的圆柱,并显示其依赖于参数。特殊BIC对于实际应用是重要的,因为它们产生具有大品质因数的谐振,用于非常大范围的$β$。

英文摘要:

Bound states in the continuum (BICs) are trapped or guided modes with their frequencies in the frequency intervals of the radiation modes. On periodic structures, a BIC is surrounded by a family of resonant modes with their quality factors approaching infinity. Typically the quality factors are proportional to $1/|β- β_*|^2$, where $β$ and $β_*$ are the Bloch wavevectors of the resonant modes and the BIC, respectively. But for some special BICs, the quality factors are proportional to $1/|β-β_*|^4$. In this paper, a general condition is derived for such special BICs on two-dimensional periodic structures. As a numerical example, we use the general condition to calculate special BICs, which are antisymmetric standing waves, on a periodic array of circular cylinders, and show their dependence on parameters. The special BICs are important for practical applications, because they produce resonances with large quality factors for a very large range of $β$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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