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Efficient side-coupling to photonic crystal nanobeam cavities via state-space overlap

Abstract

We present design guidelines for realizing side-coupled photonic crystal nanobeam (PCN) cavities with efficient coupling to low-order resonances through adjusting the overlap of the PCN cavity mode and a feeding bus waveguide in both physical and k-space. We show that optimal side-coupled configurations function at a non-zero k-vector offset between the bus waveguide and PCN cavity modes. The straightforward design of side-coupled PCNs with high-contrast resonances opens the door to their practical implementation in multiplexed, on-chip photonic devices.

© 2019 Optical Society of America

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