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Article: Non-Hermitian chiral degeneracy of gated graphene metasurfaces

TitleNon-Hermitian chiral degeneracy of gated graphene metasurfaces
Authors
Issue Date6-Apr-2023
Citation
LIGHT-SCIENCE & APPLICATIONS, 2023, v. 12, p. 1-10 How to Cite?
AbstractNon-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive manner. Here, we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene metasurface. More specifically, the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral EP. Interestingly, the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface, revealing the missing dimension at the chiral EP. In addition, the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and, consequently, the observation of enhanced asymmetric polarisation conversion. We anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs.
Persistent Identifierhttp://hdl.handle.net/10722/328462
ISSN
2023 Impact Factor: 20.6
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorBaek, S-
dc.contributor.authorPark, SH-
dc.contributor.authorOh, D-
dc.contributor.authorLee, K-
dc.contributor.authorLee, S-
dc.contributor.authorLim, H-
dc.contributor.authorHa, T-
dc.contributor.authorPark, HS-
dc.contributor.authorZhang, S-
dc.contributor.authorYang, L-
dc.contributor.authorMin, B-
dc.contributor.authorKim, TT-
dc.date.accessioned2023-06-28T04:45:10Z-
dc.date.available2023-06-28T04:45:10Z-
dc.date.issued2023-04-06-
dc.identifier.citationLIGHT-SCIENCE & APPLICATIONS, 2023, v. 12, p. 1-10-
dc.identifier.issn2095-5545-
dc.identifier.urihttp://hdl.handle.net/10722/328462-
dc.description.abstractNon-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive manner. Here, we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene metasurface. More specifically, the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral EP. Interestingly, the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface, revealing the missing dimension at the chiral EP. In addition, the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and, consequently, the observation of enhanced asymmetric polarisation conversion. We anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs.-
dc.languageeng-
dc.relation.ispartofLIGHT-SCIENCE & APPLICATIONS-
dc.titleNon-Hermitian chiral degeneracy of gated graphene metasurfaces-
dc.typeArticle-
dc.identifier.doi10.1038/s41377-023-01121-6-
dc.identifier.pmid37024464-
dc.identifier.volume12-
dc.identifier.spage1-
dc.identifier.epage10-
dc.identifier.isiWOS:000965067100003-
dc.publisher.placeLONDON-
dc.identifier.issnl2047-7538-

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