Abstract

The mode-splitting phenomenon within finite-size, mini-scale high-index-contrast gratings (HCGs) has been investigated theoretically and experimentally. The high-$Q$ resonance splits into a series of in-plane modes due to the confinement of boundaries but can still survive even on a mini-scale footprint. $Q$ factors up to $\sim 3300$ and $\sim 2200$ have been observed for the HCGs with footprints that are only $55\mathrm{\mu m}\times 300\mathrm{\mu m}$ and $27.5\mathrm{\mu m}\times 300\mathrm{\mu m}$, which would be promising for realizing optical communication and sensing applications with compact footprint.

© 2016 Optical Society of America

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