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arXiv 2103.12470math.APphysics.optics
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亚波长谐振器阵列中的束缚态和Fano共振

Bound states in the continuum and Fano resonances in subwavelength resonator arrays

Habib Ammari, Bryn Davies, Erik Orvehed Hiltunen, Hyundae Lee, Sanghyeon Yu

摘要:

当波散射系统受到某些对称性的影响时,共振态可能与远场连续体解耦;它们仍然局限于结构,并且不能被远场的入射波激发。在这项工作中,我们使用层势技术来证明这种状态的存在,被称为束缚态的连续,在亚波长谐振器的系统。当对称性被轻微破坏时,这种共振态可以从远场激发。值得注意的是,这可能会产生不对称的(Fano型)散射行为,其中对于谐振频率的任一侧上的频率,传输是根本不同的。使用渐近分析,我们明确计算系统的散射矩阵,从而表征这种Fano型传输异常。

英文摘要:

When wave scattering systems are subject to certain symmetries, resonant states may decouple from the far-field continuum; they remain localized to the structure and cannot be excited by incident waves from the far field. In this work, we use layer-potential techniques to prove the existence of such states, known as bound states in the continuum, in systems of subwavelength resonators. When the symmetry is slightly broken, this resonant state can be excited from the far field. Remarkably, this may create asymmetric (Fano-type) scattering behaviour where the transmission is fundamentally different for frequencies on either side of the resonant frequency. Using asymptotic analysis, we compute the scattering matrix of the system explicitly, thereby characterizing this Fano-type transmission anomaly.

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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