Journal
NATURE NANOTECHNOLOGY
Volume 15, Issue 12, Pages 1012-U41Publisher
NATURE RESEARCH
DOI: 10.1038/s41565-020-0773-7
Keywords
-
Funding
- National Key R&D Program of China [2017YFA0303800, 2016YFA0302400]
- Natural Science Foundation of China [11721404]
- Strategic Priority Research Program of the the Chinese Academy of Sciences [XDB33000000]
- Beijing Natural Science Foundation [Z200008]
- NSFC [11734009, 11674181]
Ask authors/readers for more resources
Cavity design is crucial for single-mode semiconductor lasers such as the ubiquitous distributed feedback and vertical-cavity surface-emitting lasers. By recognizing that both of these optical resonators feature a single mid-gap mode localized at a topological defect in the one-dimensional lattice, we upgrade this topological cavity design concept into two dimensions using a honeycomb photonic crystal with a vortex Dirac gap by applying the generalized Kekule modulations. We theoretically predict and experimentally show on a silicon-on-insulator platform that the Dirac-vortex cavities have scalable mode areas, arbitrary mode degeneracies, vector-beam vertical emission and compatibility with high-index substrates. Moreover, we demonstrate the unprecedentedly large free spectral range, which defies the universal inverse relation between resonance spacing and resonator size. We believe that our topological micro-resonator will be especially useful in applications where single-mode behaviour is required over a large area, such as the photonic-crystal surface-emitting laser. Surface emission from a topological mid-gap cavity shows large free spectral range and arbitrary mode degeneracy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available