非厄米圆柱结构中谱奇异性的处理
Harnessing Spectral Singularities in Non-Hermitian Cylindrical Structures
摘要：
非厄米系统的特点是适当的空间分布的增益和损耗可以表现出“频谱奇点”的形式的零宽度共振相关联的实际频率极点的散射算子。在这里，我们研究这个有趣的现象与圆柱形的几何形状，并探讨可能的应用程序，以非常规的方式控制和剪裁的散射响应的子波长和波长大小的对象。在可能的影响和应用中，我们说明了散射-吸收-消光权衡中的额外自由度，并解决了零前向散射，横向散射和散射图案的增益控制可重构性的工程问题，同时也注意稳定性问题。我们的研究结果可能会开辟新的前景，在主动和可重构的纳米光子学平台。
英文摘要：
Non-Hermitian systems characterized by suitable spatial distributions of gain and loss can exhibit "spectral singularities" in the form of zero-width resonances associated to real-frequency poles in the scattering operator. Here, we study this intriguing phenomenon in connection with cylindrical geometries, and explore possible applications to controlling and tailoring in unconventional ways the scattering response of sub-wavelength and wavelength-sized objects. Among the possible implications and applications, we illustrate the additional degrees of freedom available in the scattering-absorption-extinction tradeoff, and address the engineering of zero-forward-scattering, transverse scattering, and gain-controlled reconfigurability of the scattering pattern, also paying attention to stability issues. Our results may open up new vistas in active and reconfigurable nanophotonics platforms.
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