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Corner states of light in photonic waveguides
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0001-7562-7148
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 62019 (English)In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 13, no 10, p. 697-700Article in journal (Refereed) Published
Abstract [en]

The recently established paradigm of higher-order topological states of matter has shown that not only edge and surface states(1,2) but also states localized to corners, can have robust and exotic properties(3-9). Here we report on the experimental realization of novel corner states made out of visible light in three-dimensional photonic structures inscribed in glass samples using femtosecond laser technology(10,11). By creating and analysing waveguide arrays, which form two-dimensional breathing kagome lattices in various sample geometries, we establish this as a platform for corner states exhibiting a remarkable degree of flexibility and control. In each sample geometry we measure eigenmodes that are localized at the corners in a finite frequency range, in complete analogy with a theoretical model of the breathing kagome(7-9,12-14). Here, measurements reveal that light can be 'fractionalized,' corresponding to simultaneous localization to each corner of a triangular sample, even in the presence of defects.

Place, publisher, year, edition, pages
2019. Vol. 13, no 10, p. 697-700
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-175025DOI: 10.1038/s41566-019-0519-yISI: 000487333400009OAI: oai:DiVA.org:su-175025DiVA, id: diva2:1367254
Available from: 2019-11-01 Created: 2019-11-01 Last updated: 2020-03-04Bibliographically approved

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El Hassan, AshrafKunst, Flore K.Moritz, AlexanderAndler, GuillermoBergholtz, Emil J.Bourennane, Mohamed
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