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 journalArticlepeer-review

52 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 1 2003

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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