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Ultrafast optical switching in three-dimensional photonic crystals
D A Mazurenko1, R Kerst, J I Dijkhuis
1Atom Optics and Ultrafast Dynamics, Debye Institute, Department of Physics and Astronomy, University of Utrecht, PO Box 80000, 3508 TA Utrecht, The Netherlands. D.A.Mazurenko@phys.uu.nl
Physical Review Letters
|December 20, 2003
Summary
We demonstrated ultrafast optical switching in a silicon-opal photonic crystal. This novel switching, driven by photoexcited carriers, offers new possibilities for photonic device applications.
Area of Science:
- Photonics
- Materials Science
- Optoelectronics
Background:
- Photonic crystals offer unique light manipulation properties.
- Silicon-opal composites are promising for photonic applications.
- Ultrafast optical switching is crucial for next-generation optical devices.
Purpose of the Study:
- To experimentally investigate ultrafast optical switching in a 3D silicon-opal photonic crystal.
- To understand the underlying mechanisms of light-induced changes in the photonic crystal.
- To explore the potential of these materials for optical switching applications.
Main Methods:
- Fabrication of a 3D photonic crystal using a Si-opal composite.
- Experimental measurement of reflectivity changes using ultrafast laser pulses (30 fs).
- Analysis using a two-band mixing formalism model.
Main Results:
- Achieved ultrafast (30 fs) optical switching with up to 1% reflectivity change.
- Observed changes induced by photoexcited carriers in silicon.
- Demonstrated diminished constructive interference within the photonic crystal.
Conclusions:
- Silicon-opal photonic crystals exhibit ultrafast optical switching capabilities.
- Photoexcited carriers in silicon are the primary mechanism for switching.
- This research paves the way for novel all-optical switching devices.