Dirac-vortex topological cavity
Abstract
Cavity design is crucial for single-mode semiconductor lasers such as the distributed feedback (DFB) and vertical-cavity surface-emitting lasers (VCSEL). By recognizing that both optical resonators feature a single mid-gap mode localized at the topological defect in a one-dimensional (1D) lattice, we generalize the topological cavity design into 2D using a honeycomb photonic crystal with a vortex Dirac mass -- the analog of Jackiw-Rossi zero modes. We theoretically predict and experimentally demonstrate that such a Dirac-vortex cavity can have a tunable mode area across a few orders of magnitudes, arbitrary mode degeneracy, robustly large free-spectral-range, vector-beam output of low divergence, and compatibility with high-index substrates. This topological cavity could enable photonic crystal surface-emitting lasers (PCSEL) with stabler single-mode operation.
Keywords
Cite
@article{arxiv.1911.09540,
title = {Dirac-vortex topological cavity},
author = {Xiaomei Gao and Lechen Yang and Hao Lin and Lang Zhang and Jiafang Li and Fang Bo and Zhong Wang and Ling Lu},
journal= {arXiv preprint arXiv:1911.09540},
year = {2021}
}
Comments
7 pages, 5 figures. Published version at https://www.nature.com/articles/s41565-020-0773-7