Fig. 1 | Light: Science & Applications

Fig. 1

From: Topological edge state cavities: simultaneous enhancement of quality factor and free spectral range

Fig. 1The alternative text for this image may have been generated using AI.

Topological edge state cavities. a TESC coupled with a topological waveguide. The unit cell of the valley photonic crystal (VPC) consists of two equilateral air holes with side lengths \({L}_{1}\) and \({L}_{2}\). b Edge states in VPCs. Waves are confined and guided through topological edge states in TESC. c Evolution of FSR and Q with R and ΔL of TESCs. Reducing \(\Delta L\) can effectively simultaneously increase FSR and Q

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