Journal
NANOPHOTONICS
Volume 12, Issue 22, Pages 4205-4214Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2023-0485
Keywords
coherent perfect absorption; zero-index media; long-range connectivity; absorption control; geometry-invariance
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In coherent perfect absorption (CPA), the connectivity of defects plays a critical role in achieving and controlling CPA. The establishment of long-range connectivity is crucial for realizing CPA and it exhibits remarkable resilience against defects' deformation and changes in the media. Minor disruptions to this connectivity result in a complete reduction of absorption.
Coherent perfect absorption (CPA), as time-reversed lasing, arises from appropriate wave interference within absorbers, offering flexible control over wave absorption. Typically, this control involves tuning the phase difference between two counter-propagating incident beams. Here, we elucidate the critical role of defect connectivity within three-dimensional zero-index media for realizing and controlling CPA. Specifically, the realization of CPA critically depends on the establishment of long-range connectivity of defects in a specific direction. Once the long-range connectivity is established, the CPA exhibits remarkable resilience against defects' deformation, changes in size and shape of the zero-index media, as well as variations in number and orientation of incident channels. Notably, a minor disruption to this connectivity will result in a complete reduction of absorption to zero, highlighting an ultra-sensitive absorption property in response to connectivity perturbations. Our findings not only unveil a physical mechanism for realizing CPA but also open up promising avenues for advanced CPA control with versatile functionalities.
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