Journal
OPTICS EXPRESS
Volume 28, Issue 10, Pages 14428-14435Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.387993
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Funding
- Research Grants Council, University Grants Committee [GRF 17209918]
- Asian Office of Aerospace Research and Development [FA2386-17-1-0010]
- National Natural Science Foundation of China [61271158, 61975177]
- HKU Seed Fund [201711159228]
- Thousand Talents Program for Distinguished Young Scholars of China
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Chiral surface states along the zigzag edge of a valley photonic crystal in the honeycomb lattice are demonstrated. By decomposing the local fields into orbital angular momentum (OAM) modes, we find that the chiral surface states present OAM-dependent unidirectional propagation characteristics. Particularly, the propagation directivities of the surface states are quantified by the local OAM decomposition and are found to depend on the chiralities of both the source and surface states. These findings allow for the engineering control of the unidirectional propagation of electromagnetic energy without requiring an ancillary cladding layer. Furthermore, we examine the propagation of the chiral surface states against sharp bends. It turns out that although only certain states successfully pass through the bend, the unidirectional propagation is well maintained due to the topology of the structure. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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