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Conference Paper

Slow-light photonic crystal switches and modulators

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Kampfrath,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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476813.pdf
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Citation

Beggs, D. M., White, T. P., Kampfrath, T., Kuipers, K., & Krauss, T. F. (2010). Slow-light photonic crystal switches and modulators.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-F649-3
Abstract
We discuss the performance of slow-light enhanced optical switches and modulators fabricated in silicon. The switch is based on photonic crystal waveguides in a directional coupler geometry, and the dispersion of the device is engineered to allow a switching length as short as 5 µm and rerouting of optical signals within 3 ps. The 3 ps switching time is demonstrated using free carriers in the silicon generated by the absorption of a femtosecond pump pulse. The modulator is based on a Mach-Zehnder interferometer configuration, with photonic crystal waveguides in each arm to act as phase-shifters. A flat-band slow-light region has been engineered in the phase-shifters to provide an extinction ratio in excess of 15 dB over the entire 11 nm bandwidth of the modulator device.