Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes

Michael S. Arnold, Jay E. Sharping, Samuel I Stupp, Prem Kumar, Mark C Hersam

Research output: Contribution to journalArticle

50 Citations (Scopus)

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 languageEnglish
Pages (from-to)1549-1554
Number of pages6
JournalNano Letters
Volume3
Issue number11
DOIs
Publication statusPublished - Nov 2003

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Photobleaching
Single-walled carbon nanotubes (SWCN)
Energy gap
carbon nanotubes
pumps
probes
Pumps
optical materials
stimulated emission
trucks
Stimulated emission
Optical materials
saturation
Suspensions
polarization
Polarization
Infrared radiation
lasers
Electrons
Lasers

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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 journalArticle

Arnold, Michael S. ; Sharping, Jay E. ; Stupp, Samuel I ; Kumar, Prem ; Hersam, Mark C. / Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes. In: Nano Letters. 2003 ; Vol. 3, No. 11. pp. 1549-1554.
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