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Nonlinear absorption and dispersion in fiber-taper-coupled silicon photonic crystal microresonators

Paul E. Barclay·Kartik Srinivasan·Oskar Painter
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Abstract

A technique is demonstrated which efficiently transfers light between a tapered standard single-mode optical fiber and a high-Q, ultra-small mode volume, silicon photonic crystal resonant cavity. Cavity mode quality factors of 47000 are measured, and a total fiber-to-cavity coupling efficiency of 44% is demonstrated. Using this efficient cavity input and output channel, the steady-state nonlinear absorption and dispersion of the photonic crystal cavity is studied. Optical bistability is observed for fiber input powers as low as 250 μW, corresponding to a dropped power of 100 μW and 3 fJ of stored cavity energy. A high-density effective free-carrier lifetime for these silicon photonic crystal resonators of 0.5 ns is also estimated from power dependent loss and dispersion measurements.

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Paul E. Barclay, Kartik Srinivasan, Oskar Painter. 2004-12-01. Nonlinear absorption and dispersion in fiber-taper-coupled silicon photonic crystal microresonators. https://arxiv.org/abs/physics/0412002

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