Abstract
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 ∼1 kW cm-2 and for probe intensities approaching ∼500 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1549-1554 |
| Number of pages | 6 |
| Journal | Nano Letters |
| Volume | 3 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2003 |
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ASJC Scopus subject areas
- Materials Science(all)
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Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes. / Arnold, Michael S.; Sharping, Jay E.; Stupp, Samuel I; Kumar, Prem; Hersam, Mark C.
In: Nano Letters, Vol. 3, No. 11, 11.2003, p. 1549-1554.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes
AU - Arnold, Michael S.
AU - Sharping, Jay E.
AU - Stupp, Samuel I
AU - Kumar, Prem
AU - Hersam, Mark C
PY - 2003/11
Y1 - 2003/11
N2 - 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 ∼1 kW cm-2 and for probe intensities approaching ∼500 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.
AB - 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 ∼1 kW cm-2 and for probe intensities approaching ∼500 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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UR - http://www.scopus.com/inward/citedby.url?scp=0345119048&partnerID=8YFLogxK
U2 - 10.1021/nl034726f
DO - 10.1021/nl034726f
M3 - Article
VL - 3
SP - 1549
EP - 1554
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 11
ER -