A high-performance topological bulk laser based on band-inversion-induced reflection
| Autor: | Xing-Xiang Wang, Hua-Zhou Chen, Zengkai Shao, Xin-Rui Mao, Suo Wang, Zhen-Qian Yang, Xiao Hu, Ren-Min Ma, Shao-Lei Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Biomedical Engineering Physics::Optics Bioengineering 02 engineering and technology 010402 general chemistry Topology 01 natural sciences law.invention Laser linewidth law General Materials Science Electrical and Electronic Engineering Spectroscopy Electrical conductor business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics Cladding (fiber optics) Laser Atomic and Molecular Physics and Optics 0104 chemical sciences Semiconductor Topological insulator 0210 nano-technology business Lasing threshold |
| Zdroj: | Nature Nanotechnology. 15:67-72 |
| ISSN: | 1748-3395 1748-3387 |
| DOI: | 10.1038/s41565-019-0584-x |
| Popis: | Topological insulators are materials that behave as insulators in the bulk and as conductors at the edge or surface due to the particular configuration of their bulk band dispersion. However, up to date possible practical applications of this band topology on materials' bulk properties have remained abstract. Here, we propose and experimentally demonstrate a topological bulk laser. We pattern semiconductor nanodisk arrays to form a photonic crystal cavity showing topological band inversion between its interior and cladding area. In-plane light waves are reflected at topological edges forming an effective cavity feedback for lasing. This band-inversion-induced reflection mechanism induces single-mode lasing with directional vertical emission. Our topological bulk laser works at room temperature and reaches the practical requirements in terms of cavity size, threshold, linewidth, side-mode suppression ratio and directionality for most practical applications according to Institute of Electrical and Electronics Engineers and other industry standards. We believe this bulk topological effect will have applications in near-field spectroscopy, solid-state lighting, free-space optical sensing and communication. |
| Databáze: | OpenAIRE |
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