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Three-Layer Heterostructure Topological Laser Based on the Valley-Hall Photonic Crystal
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DOI：10.1109/JLT.2025.3585190.png)
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Abstract
En 中文
Valley-Hall photonic crystal (PhC) slab has emerged as a promising platform for planar integrated applications in photonics and optoelectronics. Although the topologically-protected edge states of valley-Hall PhC are momentum-locked to K/K′ valleys, the wave propagation still suffers from considerable out-of-plane scattering loss. Here, we embed a layer of PhC featuring Dirac cone dispersion at K/K′ points in a conventional valley-Hall topological waveguide and devise the first three-layer heterostructure laser cavity. The out-of-plane scattering loss of edge state is significantly mitigated. Accordingly, the fabricated laser device with the novel cavity design emits in a single mode and exhibits a lower threshold power density compared to the laser with conventional valley-Hall topological cavity.
Keywords:
Photonic crystal heterostructure
topological laser
valley-Hall photonic crystal
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1.7W
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3.8W