All-Si valley-Hall photonic topological insulator
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Open Access
- 1 February 2016
- journal article
- research article
- Published by IOP Publishing in New Journal of Physics
- Vol. 18 (2), 025012
- https://doi.org/10.1088/1367-2630/18/2/025012
Abstract
An all-Si photonic structure emulating the quantum-valley-Hall effect is proposed. We show that it acts as a photonic topological insulator (PTI), and that an interface between two such PTIs can support edge states that are free from scattering. The conservation of the valley degree of freedom enables efficient in- and out-coupling of light between the free space and the photonic structure. The topological protection of the edge waves can be utilized for designing arrays of resonant time-delay photonic cavities that do not suffer from reflections and cross-talk.Keywords
Funding Information
- National Science Foundation (PHY-1415547)
- Air Force Office of Scientific Research (FA9550-15-1-0075)
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