Non-Hermitian metasurface with non-trivial topology

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dc.citation.firstpage1159
dc.citation.issueNumber6
dc.citation.journalTitleNanophotonics
dc.citation.lastpage1165
dc.citation.volumeNumber11
dc.contributor.authorYang, Frank
dc.contributor.authorPrasad, Ciril S.
dc.contributor.authorLi, Weijian
dc.contributor.authorLach, Rosemary
dc.contributor.authorEveritt, Henry O.
dc.contributor.authorNaik, Gururaj V.
dc.date.accessioned2022-04-28T14:28:24Z
dc.date.available2022-04-28T14:28:24Z
dc.date.issued2022
dc.description.abstractThe synergy between topology and non-Hermiticity in photonics holds immense potential for next-generation optical devices that are robust against defects. However, most demonstrations of non-Hermitian and topological photonics have been limited to super-wavelength scales due to increased radiative losses at the deep-subwavelength scale. By carefully designing radiative losses at the nanoscale, we demonstrate a non-Hermitian plasmonic–dielectric metasurface in the visible with non-trivial topology. The metasurface is based on a fourth order passive parity-time symmetric system. The designed device exhibits an exceptional concentric ring in its momentum space and is described by a Hamiltonian with a non-Hermitian Z 3 ${\mathbb{Z}}_{3}$ topological invariant of V = −1. Fabricated devices are characterized using Fourier-space imaging for single-shot k -space measurements. Our results demonstrate a way to combine topology and non-Hermitian nanophotonics for designing robust devices with novel functionalities.
dc.identifier.citationYang, Frank, Prasad, Ciril S., Li, Weijian, et al.. "Non-Hermitian metasurface with non-trivial topology." <i>Nanophotonics,</i> 11, no. 6 (2022) De Gruyter: 1159-1165. https://doi.org/10.1515/nanoph-2021-0731.
dc.identifier.digital10-1515_nanoph-2021-0731
dc.identifier.doihttps://doi.org/10.1515/nanoph-2021-0731
dc.identifier.urihttps://hdl.handle.net/1911/112158
dc.language.isoeng
dc.publisherDe Gruyter
dc.rightsThis work is licensed under the Creative Commons Attribution 4.0 International License.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleNon-Hermitian metasurface with non-trivial topology
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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