Observation of Type I Photonic Weyl Points in Optical Frequencies

Goi, E, Yue, Z, Cumming, B and Gu, M 2018, 'Observation of Type I Photonic Weyl Points in Optical Frequencies', Laser and Photonics Reviews, vol. 12, no. 2, pp. 1-9.

Document type: Journal Article
Collection: Journal Articles

Title Observation of Type I Photonic Weyl Points in Optical Frequencies
Author(s) Goi, E
Yue, Z
Cumming, B
Gu, M
Year 2018
Journal name Laser and Photonics Reviews
Volume number 12
Issue number 2
Start page 1
End page 9
Total pages 9
Publisher Wiley
Abstract Manipulation of momentum space in photonic structures has enabled a range of physical phenomena including negative refraction, slow light, enhanced nonlinearity and three-dimensional complete bandgaps. Recently, Topology, a property related to the global structure of the frequency dispersion of a photonic system, emerged as a new tool for the control of momentum space and an additional degree of freedom for the discovery of fundamentally new states of light. The Weyl point systems considered in this work are an excellent platform to investigate topological bosonic states. Weyl points act as monopoles or anti-monopoles Berry flux in momentum space, and carry chirality defined by quantised topological charges. In this work, the experimental realisation of photonic type I Weyl points at optical frequencies is demonstrated in a bio-inspired three-dimensional photonic crystal coated uniquely with layered-composite nanometric materials. More importantly, the chiral nature of the photonic Weyl points is discovered by coupling with spin-angular momentum carried by circularly polarised light. This Weyl-point induced mechanism leads to reversed circular dichroism along the directions that intersect the oppositely charged topological photonic states. This discovery provides an entirely new platform for developing topologically protected super-robust photonic devices in angular-momentum-based information processing, circular-dichroism-enabled protein sensing, spintronics and quantum optoelectronics. © 2017 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Subject Mathematical Physics not elsewhere classified
Optical Physics not elsewhere classified
Physical Sciences not elsewhere classified
Keyword(s) gyroids
spin-angular momentum
topological photonics
Weyl points
DOI - identifier 10.1002/lpor.201700271
Copyright notice © 2017 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 1863-8880
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