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231226s2024 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202303891
|2 doi
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|a eng
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| 100 |
1 |
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|a Sol, Jérôme
|e verfasserin
|4 aut
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| 245 |
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|a Covert Scattering Control in Metamaterials with Non-Locally Encoded Hidden Symmetry
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 14.03.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2023 Wiley-VCH GmbH.
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|a Symmetries and tunability are of fundamental importance in wave scattering control, but symmetries are often obvious upon visual inspection, which constitutes a significant vulnerability of metamaterial wave devices to reverse-engineering risks. Here, it is theoretically and experimentally shown that a symmetry in the reduced basis of the "primary meta-atoms" that are directly connected to the outside world is sufficient; meanwhile, a suitable topology of non-local interactions between them, mediated by the internal "secondary" meta-atoms, can hide the symmetry from sight in the canonical basis. Covert symmetry-based scattering control in a cable-network metamaterial featuring a hidden parity ( P $\mathcal {P}$ ) symmetry in combination with hidden- P $\mathcal {P}$ -symmetry-preserving and hidden- P $\mathcal {P}$ -symmetry-breaking tuning mechanisms is experimentally demonstrated. Physical-layer security in wired communications is achieved using the domain-wise hidden P $\mathcal {P}$ -symmetry as a shared secret between the sender and the legitimate receiver. Within the approximation of negligible absorption, the first tuning of a complex scattering metamaterial without mirror symmetry to feature exceptional points (EPs) of PT $\mathcal {PT}$ -symmetric reflectionless states, as well as quasi-bound states in the continuum, is reported. These results are reproduced in metamaterials involving non-reciprocal interactions between meta-atoms, including the first observation of reflectionless EPs in a non-reciprocal system
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|a Journal Article
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|a hidden symmetry
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|a non-locality
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|a non-reciprocity
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|a physical layer security
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|a programmable metamaterials
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|a reflectionless exceptional point
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| 650 |
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|a reverse-engineering resilience
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| 700 |
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|a Röntgen, Malte
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Del Hougne, Philipp
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 36(2024), 11 vom: 01. März, Seite e2303891
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
1 |
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|g volume:36
|g year:2024
|g number:11
|g day:01
|g month:03
|g pages:e2303891
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| 856 |
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|u http://dx.doi.org/10.1002/adma.202303891
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