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Room-temperature lasing from nanophotonic topological cavities.
Daria Smirnova1,2, Aditya Tripathi1,3, Sergey Kruk1
1Nonlinear Physics Center, Research School of Physics, Australian National University, Canberra, ACT 2601 Australia.
Light, Science & Applications
|July 25, 2020
Summary
Researchers created novel topological lasers using semiconductor quantum wells. These compact, disorder-immune devices exhibit room-temperature lasing with unique beam characteristics, paving the way for advanced light sources.
Area of Science:
- Photonics
- Condensed Matter Physics
- Nanotechnology
Background:
- Topological photonics offers a route to robust optical devices immune to disorder.
- Integrating optical gain into topological structures enables novel laser designs.
- Nanoscale lasers with tailored properties are crucial for integrated optics.
Purpose of the Study:
- To propose and experimentally demonstrate active nanophotonic topological cavities.
- To investigate room-temperature lasing in these novel structures.
- To characterize the radiation properties of the emitted beam.
Main Methods:
- Fabrication of nanophotonic topological cavities incorporating III-V semiconductor quantum wells.
- Experimental observation and characterization of room-temperature lasing.
- Analysis of the emitted beam's singularity and cavity mode properties.
Main Results:
- Successful room-temperature lasing with narrow spectrum, high coherence, and clear threshold behavior.
- Observation of a beam singularity encoded by a triade cavity mode.
- Cavity mode residing in the bandgap of interfaced valley-Hall photonic lattices.
Conclusions:
- Demonstrated the feasibility of active nanophotonic topological cavities for lasing.
- Highlighted the potential for topologically controlled ultrasmall light sources.
- Showcased unique radiation characteristics stemming from nontrivial band topology.
