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Bound states in the continuum in a two-dimensional PT - symmetric system

机译:在二维PT - 对称系统中连续界的绑定状态

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摘要

We address a 2D parity-time (PT)-symmetric structure built as a chain of waveguides, where all waveguides except for the central one are conservative, while the central one is divided into two halves with gain and losses. We show that such a system admits bound states in the continuum (BICs) whose properties vary drastically with the orientation of the line separating amplifying and absorbing domains, which sets the direction of internal energy flow. When the flow is perpendicular to the chain of the waveguides, narrow BICs emerge when the standard defect mode, which is initially located in the finite gap, collides with another mode in a standard symmetry breaking scenario, and its propagation constant enters the continuous spectrum upon increase of the strength of gain/losses. In contrast, when the energy flow is parallel to the chain of the waveguides, the symmetry gets broken even for a small strength of the gain/losses. In that case, the most rapidly growing mode emerges inside the continuous spectrum and realizes a weakly localized BIC. All BICs found here are the most rapidly growing modes; therefore, they can be excited from noisy inputs and, importantly, should dominate the beam dynamics in experiments. (C) 2018 Optical Society of America
机译:我们地址作为一个波导链构建的2D奇偶校验时间(PT) - MMMETRIC结构,其中除了中央之外的所有波导是保守的,而中央的波导被分成两半,增益和损失。我们表明,这种系统承认了连续内(BIC)中的绑定状态,其特性随着线路分离和吸收域的方向而变化,其设定内部能量流动的方向。当流程垂直于波导链时,当最初位于有限间隙中的标准缺陷模式时,窄的BIC在标准对称性破坏场景中与另一模式碰撞时,其传播常数进入连续频谱增加收益/损失的强度。相反,当能量流平行于波导链时,即使用于增加增益/损耗的小强度,对称性也被打破。在这种情况下,在连续频谱内部出现最快的生长模式,实现了弱局部的BIC。这里发现的所有BIC是最迅速增长的模式;因此,它们可以从嘈杂的投入兴奋,重要的是,应该在实验中主导光束动力学。 (c)2018年光学学会

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  • 来源
    《Optics Letters》 |2018年第3期|共4页
  • 作者单位

    Barcelona Inst Sci &

    Technol ICFO Inst Ciencies Foton Castelldefels 08860 Barcelona Spain;

    Barcelona Inst Sci &

    Technol ICFO Inst Ciencies Foton Castelldefels 08860 Barcelona Spain;

    Univ Lisbon Fac Ciencias Ctr Fis Teor &

    Computac Campo Grande 2 Edificio C8 P-1749016 Lisbon Portugal;

    Barcelona Inst Sci &

    Technol ICFO Inst Ciencies Foton Castelldefels 08860 Barcelona Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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