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Asymmetric topological edge states in a quasiperiodic Harper chain composed of split-ring resonators.
- Source :
-
Optics letters [Opt Lett] 2018 Oct 15; Vol. 43 (20), pp. 5142-5145. - Publication Year :
- 2018
-
Abstract
- Quasiperiodic structures have recently been found to possess salient topological properties. In this Letter, we theoretically and experimentally demonstrate the topological edge states in a quasiperiodic Harper chain composed of split-ring resonators. In a finite-size Harper chain, we find that there is always a pair of edge states in the bandgaps, independent of the number of the resonators. Different from the topological edge states localized at both ends of a periodic chain, this pair of edge states is selectively localized at the left or right end of the quasiperiodic chain at different frequencies. These paired-edge states with asymmetric field distribution can be used for unidirectional propagation. Our results not only provide a versatile platform to study the topological physics beyond the periodic structures but also may be useful in some applications such as selective unidirectional power transfer.
Details
- Language :
- English
- ISSN :
- 1539-4794
- Volume :
- 43
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- Optics letters
- Publication Type :
- Academic Journal
- Accession number :
- 30320840
- Full Text :
- https://doi.org/10.1364/OL.43.005142