Journal
NANO LETTERS
Volume 13, Issue 2, Pages 722-727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3044053
Keywords
Optical logic; nanocrystals; multiexcitons; optical gain; switching; optical modulation
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Funding
- CFI
- NSERC
- FQRNT
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Optical pumping of semiconductor nanocrystals with femtosecond pulse sequences was performed in order to modulate multiexciton populations. We show for the first time that control of multiexciton populations produces high speed modulation of stimulated emission. Upon the basis of the speed of multiexcitonic processes in nanocrystals, we show modulation rates approaching 1 THz by virtue of strong quantum confinement effects. Employing femtosecond optical pulse sequences, we demonstrate all-optical logic using these nanocrystals in two forms: an AND gate, and an inverter, a key step toward all optical signal processing.
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