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Perfect Absorption in a Disordered Medium with Programmable Meta-Atom Inclusions

机译：具有可编程元原子夹杂物的无序培养基中的完美吸收

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摘要

Achieving the very special condition of perfect absorption (PA) in a complex scattering enclosure promises to enable a wealth of applications in secure communication, precision sensing, wireless power transfer, analog signal processing, and random lasing. Consequently, a lot of recent research effort is dedicated to proposing wave-front shaping protocols to implement coherent PA in complex scattering environments with tunable localized absorption as well as a tunable excitation frequency. Here, the conceptually different route of solely tweaking the randomness of the complex scattering environment in order to achieve PA is proposed. An experimental proof-of-concept in the microwave domain is provided where the randomness of a 3D chaotic cavity is tuned with programmable meta-atom inclusions. The achievability and extreme sensitivity of the PA condition are systematically investigated. The presented technique can impose a PA condition at over hundred distinct frequencies within a small frequency band, enabling the proposal and experimental demonstration of a concrete practical application: receiver-powered secure wireless communication in a complex scattering enclosure. The presented fundamentally new perspective on PA applies to all types of wave phenomena; the experimental results foreshadow the large potential of this novel tool for minute wave control in sensing, communication, and energy transfer.
机译：在复杂的散射外壳中实现完美吸收（PA）的非常特殊的条件，以实现安全通信，精密感测，无线电力传输，模拟信号处理和随机激光的大量应用。因此，最近的许多研究努力专用于提出波浪前成型协议，以实现具有可调谐局部吸收的复杂散射环境中的相干PA以及可调谐激励频率。在这里，提出了概念上不同的路线，仅调整复杂散射环境的随机性，以实现PA。提供微波结构域中的实验概念概念，其中3D混沌腔的随机性与可编程元原子夹杂物一起调整。 PA条件的可实现性和极端敏感性得到系统地研究。呈现的技术可以在小频带内施加超过百分之一的频率的PA条件，使得具体实际应用的提议和实验示范：在复杂的散射外壳中的接收器供电的安全无线通信。关于PA的基本新的视角适用于所有类型的波浪现象;实验结果预示着这种新颖工具的大潜力，用于传感，通信和能量转移中的微小波控制。

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