Ultrafast optical switching with CdTe nanocrystals in a glass matrix

Padilha, L. A.; Neves, A. A. R.; Rodriguez, E.; Cesar, C. L.; Barbosa, L. C.; Cruz, C. H. Brito
April 2005
Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p161111
Academic Journal
This letter describes a principle demonstration of an ultrafast optical switch operating at 1 Tbit/s using CdTe-quantum-dots-doped glasses. Using a three-beam pump and probe experiment, we showed that thermal effects are responsible for a baseline in the pump and probe graphs and the nonexistence of carrier accumulation effects. After eliminating the thermal effects, we showed that, when two pump pulses are delayed by 1 ps, each pump pulse modulates the probe pulse independently, making this material highly promising for ultrafast all optical switching.


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