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Electromagnetic wave coupling between photonic systems relies on theevanescent field typically confined within a single wavelength. Extendingevanescent coupling distance requires low refractive index contrast and perfectmomentum matching for achieving a large coupling ratio. Here, we report thediscovery of photonic supercoupling in a topological valley Hall pair ofwaveguides, showing a substantial improvement in coupling efficiency acrossmultiple wavelengths. Experimentally, we realize ultra-high coupling ratiosbetween waveguides through valley-conserved vortex flow of electromagneticenergy, attaining 95% coupling efficiency for separations of up to threewavelengths. This demonstration of photonic supercoupling in topologicalsystems significantly extends the coupling distance between on-chip waveguidesand components, paving the path for the development of supercoupled photonicintegrated devices, optical sensing, and telecommunications.

Photonic Supercoupling in Silicon Topological Waveguides