One-dimensional planar topological laser
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Topological interface states are formed when two photonic crystals with overlapping band gaps are brought into contact. In this work, we show a planar binary structure with such an interface state in the visible spectral region. Furthermore, we incorporate a thin layer of an active organic material into the structure, providing gain under optical excitation. We observe a transition from fluorescence to lasing under sufficiently strong pump energy density. These results are the first realization of a planar topological laser, based on a topological interface state instead of a cavity like most of other laser devices. We show that the topological nature of the resonance leads to a so-called "topological protection", i.e. stability against layer thickness variations as long as inversion symmetry is preserved: even for large changes in thickness of layers next to the interface, the resonant state remains relatively stable, enabling design flexibility superior to conventional planar microcavity devices.
Details
Original language | English |
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Pages (from-to) | 2459-2465 |
Number of pages | 7 |
Journal | NANOPHOTONICS |
Volume | 10 |
Issue number | 9 |
Publication status | Published - Jul 2021 |
Peer-reviewed | Yes |
External IDs
Scopus | 85108068682 |
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Keywords
Keywords
- laser, microcavity, photonic crystal, topological photonics