Terahertz Bandwidth All-Optical Modulation and Logic Using Multiexcitons in Semiconductor Nanocrystals

被引：21
作者：
Saari, Jonathan I. [1 ]
Krause, Michael M. [1 ]
Walsh, Brenna R. [1 ]
Kambhampati, Patanjali [1 ]
机构：
[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2K6, Canada
来源：
NANO LETTERS | 2013年 / 13卷 / 02期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Optical logic; nanocrystals; multiexcitons; optical gain; switching; optical modulation; DYNAMICS; GAIN;
D O I：
10.1021/nl3044053
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
收藏
页码：722 / 727
页数：6
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