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arXiv · 1311.0997

High-Q silicon photonic crystal cavity for enhanced optical nonlinearities

Ulagalandha Perumal Dharanipathy·Momchil Minkov·Mario Tonin·Vincenzo Savona·Romuald Houdré
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Abstract

We fabricate and experimentally characterize a $H0$ photonic crystal slab nanocavity with a design optimized for maximal quality factor, $Q = 1.7$ million. The cavity, fabricated from a silicon slab, has a resonant mode at $λ= 1.59 \mathrm{μm}$ and a measured $Q$-factor of $400,000$. It displays nonlinear effects, including high-contrast optical bistability, at a threshold power among the lowest ever reported for a silicon device. With a theoretical modal volume as small as $V = 0.34(λ/n)^3$, this cavity ranks among those with the highest $Q/V$ ratios ever demonstrated, while having a small footprint suited for integration in photonic circuits.

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Ulagalandha Perumal Dharanipathy, Momchil Minkov, Mario Tonin, Vincenzo Savona, Romuald Houdré. 2014-09-10. High-Q silicon photonic crystal cavity for enhanced optical nonlinearities. https://doi.org/10.1063/1.4894441

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