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Asymmetric transmission of light in hybrid waveguide-integrated plasmonic crystals on a silicon-on-insulator platform

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Abstract

We demonstrate asymmetric transmission of light in hybrid waveguide-integrated plasmonic crystals where triangular silver islands create a regular array of nanogaps which couple to an underlying silicon-on-insulator optical waveguide. Up to 60% difference is observed between light transmission in the forward and backward directions. This asymmetric transmission of light is not caused by an external magnetic field or nonlinearity, but solely a consequence of the structure geometry.

© 2019 Optical Society of America

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