Defying conventional wisdom, scientists have discovered a novel coupling mechanism involving leaky mode, previously considered unsuitable for high-density integration in photonic circuits. This surprising discovery paves the way for dense photonic integration, transforming the potential and scala
, and his students at Texas Tech University demonstrated that an anisotropic leaky wave can achieve zero crosstalk between closely spaced identical waveguides using subwavelength grating . This counter-intuitive discovery drastically increases the coupling length of transverse-magnetic mode, which has historically posed challenges due to its low confinement.
“Our group has been exploring SWGs for dense photonic integration, achieving significant improvements. However, previous approaches were limited to TE polarization only. In a photonic chip, there is another orthogonal polarization TM, which can double the chip capacity and is sometimes more desired than TE, such as in evanescent-field sensing. TM is more difficult to integrate densely than TE because it is typically less confined with a low width-to-height waveguide aspect ratio,” Kim explained.
Applying coupled-mode analysis to the modal properties of leaky SWG modes, they uncovered unique anisotropic perturbation with leaky-like mode, resulting in zero crosstalk between closely spaced identical SWG waveguides.
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