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Journal Article

Circular Grating Resonators as Small Mode-Volume Microcavities for Switching

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Schoenenberger, S., Moll, N., Stoeferle, T., Mahrt, R. F., Offrein, B. J., Götzinger, S., et al. (2009). Circular Grating Resonators as Small Mode-Volume Microcavities for Switching. Optics Express, 17, 5953-5964. doi:10.1364/OE.17.005953.

Cite as: http://hdl.handle.net/21.11116/0000-0002-9A4F-9
We demonstrate the suitability of microcavities based on circular grating resonators (CGRs) as fast switches. This type of optical resonator is characterized by a high quality factor and very small mode volume. The waveguide-coupled CGRs are fabricated with silicon-on-insulator technology compatible with standard complementary metal-oxide semiconductor (CMOS) processing. The linear optical properties of the CGRs are investigated by transmission spectroscopy. From 3D finite-difference time-domain simulations of isolated CGRs, we identify the measured resonances. We probe the spatial distribution and the parasitic losses of a resonant optical mode with scanning near-field optical microscopy. We observe fast all-optical switching within a few picoseconds by optically generating free charge carriers within the cavity. (C) 2009 Optical Society of America