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Breaking Symmetry in Triangular Lattice PCSELs: Coupled Wave Theory Analysis
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DOI：10.1109/jstqe.2026.3714916.png)
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Abstract
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A preliminary exploration of symmetry breaking in the triangular lattice photonic crystal surface emitting laser (PCSEL) is outlined. This analysis shows that greater single mode stability and optical efficiencies can be achieved for asymmetric unit cell designs in triangular lattices. In particular, changing the fill factor alone, for void containing or all-semiconductor wedge unit cell devices can provide significant tunability of the radiation constant and gain discrimination. This opens up routes for the use of asymmetric unit cells in triangular lattices to enhance PCSEL performance.
Keywords:
Coupled wave theory
triangular lattice
asymmetry
PCSEL
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