Photonic Supercoupling in Silicon Topological Waveguides
Abstract
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.
Cite
@article{arxiv.2401.10508,
title = {Photonic Supercoupling in Silicon Topological Waveguides},
author = {Ridong Jia and Yi Ji Tan and Nikhil Navaratna and Abhishek Kumar and Ranjan Singh},
journal= {arXiv preprint arXiv:2401.10508},
year = {2024}
}
Comments
8 pages, 4 figures