Details

Autor(en) / Beteiligte

• Palatnik, Alexander
• Sudzius, Markas
• Meister, Stefan
• Leo, Karl

Titel

One-dimensional planar topological laser

Ist Teil von

• Nanophotonics (Berlin, Germany), 2021-07, Vol.10 (9), p.2459-2465

Ort / Verlag

Berlin: De Gruyter

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• 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.