Photonic Supercoupling in Silicon Topological Waveguides

Electromagnetic wave coupling between photonic systems relies on the evanescent field typically confined within a single wavelength. Extending evanescent coupling distance requires low refractive index contrast and perfect momentum matching for achieving a large coupling ratio. Here, we report the d...

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Bibliographic Details
Published in:arXiv.org 2024-01
Main Authors: Jia, Ridong, Yi Ji Tan, Navaratna, Nikhil, Kumar, Abhishek, Singh, Ranjan
Format: Article
Language:English
Subjects:
Coupling
Electromagnetic radiation
Photonics
Refractivity
Topology
Waveguides
Wavelengths
Online Access:Get full text
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Summary:Electromagnetic wave coupling between photonic systems relies on the evanescent field typically confined within a single wavelength. Extending evanescent coupling distance requires low refractive index contrast and perfect momentum matching for achieving a large coupling ratio. Here, we report the discovery of photonic supercoupling in a topological valley Hall pair of waveguides, showing a substantial improvement in coupling efficiency across multiple wavelengths. Experimentally, we realize ultra-high coupling ratios between waveguides through valley-conserved vortex flow of electromagnetic energy, attaining 95% coupling efficiency for separations of up to three wavelengths. This demonstration of photonic supercoupling in topological systems significantly extends the coupling distance between on-chip waveguides and components, paving the path for the development of supercoupled photonic integrated devices, optical sensing, and telecommunications.
ISSN:2331-8422