Band gap photobleaching in isolated single-walled carbon nanotubes

被引：50
作者：
Arnold, MS
Sharping, JE
Stupp, SI
Kumar, P
Hersam, MC [1 ]
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Northwestern Univ, Dept Elect & Comp Engn, Evanston, IL 60208 USA
[3] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
[4] Northwestern Univ, Feinberg Sch Med, Dept Phys & Astron, Evanston, IL 60208 USA
来源：
NANO LETTERS | 2003年 / 3卷 / 11期
关键词：
D O I：
10.1021/nl034726f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Using pump-probe characterization, band gap photobleaching has been observed from semiconducting single-walled carbon nanotubes (SWNTs) isolated in aqueous suspensions in an effort to evaluate SWNTs as a near-infrared optical material. The measured photobleaching was optimized for co-polarization of pump and probe lasers in resonance with the second and first van Hove transitions, respectively. A saturation of photobleaching intensity was observed for large pump intensities greater than similar to1 kW cm(-2) and for probe intensities approaching similar to500 W cm(-2). The observed photobleaching is attributed to the relaxation of excited electron-hole pairs to the band edges, resulting in decreased absorption and increased stimulated emission.
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页码：1549 / 1554
页数：6
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