Tradeoff between mode confinement, loss, and cross-talk, for dielectric and metal slot waveguides

Bozena Jaskorzynska, Yi Song, Min Qiu,


Slot waveguides formed in high-index dielectrics or metals provide strong field enhancement in the slot region. When filled with nonlinear or lasing materials, they have the potential for highly efficient components for intensity dependent signal processing in integrated photonic circuits. In view of the increasing demand for high integration, metal slot waveguides have the great advantage of sub-diffraction mode confinement but they suffer from serious transmission loss. The total lateral field extent in their low-loss dielectric counterparts is, in turn, diffraction limited. Considering those tradeoffs, we show that at 24dB/um cross-talk and the attenuation length of at least 5um, gold slot waveguides can be spaced only ca 3.5 times denser than slot waveguides in silicon.

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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
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ISSN: 2080-2242