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On-Demand Coherent Perfect Absorption in Complex Scattering Systems: Time Delay Divergence and Enhanced Sensitivity to Perturbations
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-05-18 , DOI: 10.1002/lpor.202000471
Philipp del Hougne 1 , K. Brahima Yeo 1 , Philippe Besnier 1 , Matthieu Davy 1
Affiliation  

Non-Hermitian photonic systems capable of perfectly absorbing incident radiation recently attracted much attention both because fundamentally they correspond to an exotic scattering phenomenon (real-valued scattering matrix zero) and because their extreme sensitivity holds great technological promise. The sharp reflection dip is a hallmark feature underlying many envisioned applications in precision sensing, secure communication, and wave filtering. However, a rigorous link between the underlying scattering anomaly and the system's sensitivity to a perturbation is still missing. Here, a theoretical description in complex scattering systems is developed which quantitatively explains the reflection dip's shape. It is furthermore demonstrated that coherent perfect absorption (CPA) is associated with a phase singularity and that the sign of the diverging time delay is related to the mismatch between excitation rate and intrinsic decay rate. The theoretical predictions are confirmed in experiments based on a 3D chaotic cavity excited by eight channels. Rather than relying on operation frequency and attenuation inside the system to be two free parameters, “on-demand” CPA is achieved at an arbitrary frequency by tweaking the chaotic cavity's scattering properties with programmable meta-atom inclusions. Finally, the optimal sensitivity of the CPA condition to minute perturbations of the system is proven theoretically and verified experimentally.

中文翻译:

复杂散射系统中的按需相干完美吸收:时间延迟发散和对扰动的增强敏感性

能够完美吸收入射辐射的非厄米光子系统最近引起了很多关注,因为它们基本上对应于一种奇异的散射现象(实值散射矩阵为零),并且因为它们的极端灵敏度具有巨大的技术前景。急剧的反射倾角是精密传感、安全通信和滤波器等许多预想应用的标志性特征。然而,潜在的散射异常与系统对扰动的敏感性之间的严格联系仍然缺失。在这里,开发了复杂散射系统的理论描述,它定量地解释了反射倾角的形状。进一步证明,相干完美吸收 (CPA) 与相位奇异性相关,并且发散时间延迟的符号与激发速率和固有衰减速率之间的不匹配有关。理论预测在基于由八个通道激发的 3D 混沌腔的实验中得到证实。不是依靠系统内部的操作频率和衰减作为两个自由参数,“按需”CPA 是通过使用可编程元原子夹杂物调整混沌腔的散射特性以任意频率实现的。最后,从理论上证明了 CPA 条件对系统微小扰动的最佳灵敏度,并通过实验进行了验证。理论预测在基于由八个通道激发的 3D 混沌腔的实验中得到证实。不是依靠系统内部的操作频率和衰减作为两个自由参数,“按需”CPA 是通过使用可编程元原子夹杂物调整混沌腔的散射特性以任意频率实现的。最后,从理论上证明了 CPA 条件对系统微小扰动的最佳灵敏度,并通过实验进行了验证。理论预测在基于由八个通道激发的 3D 混沌腔的实验中得到证实。不是依靠系统内部的操作频率和衰减作为两个自由参数,“按需”CPA 是通过使用可编程元原子夹杂物调整混沌腔的散射特性以任意频率实现的。最后,从理论上证明了 CPA 条件对系统微小扰动的最佳灵敏度,并通过实验进行了验证。s 具有可编程元原子夹杂物的散射特性。最后,从理论上证明了 CPA 条件对系统微小扰动的最佳灵敏度,并通过实验进行了验证。s 具有可编程元原子夹杂物的散射特性。最后,从理论上证明了 CPA 条件对系统微小扰动的最佳灵敏度,并通过实验进行了验证。
更新日期:2021-07-08
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