Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes

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

doi:10.1021/nl034726f

Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes

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

Northwestern University

Research output: Contribution to journal › Article › peer-review

53 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 language	English
Pages (from-to)	1549-1554
Number of pages	6
Journal	Nano letters
Volume	3
Issue number	11
DOIs	https://doi.org/10.1021/nl034726f
Publication status	Published - Nov 1 2003

ASJC Scopus subject areas

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

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title = "Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes",

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.",

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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 - 2003/11/1

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