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Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

Published online by Cambridge University Press:  31 January 2011

Jigang Wang ,
Matt W. Graham ,
Yingzhong Ma ,
Graham R. Fleming  and
Robert A Kaindl
Jigang Wang
Affiliation:
jwang@ameslab.gov, Iowa State University and Ames Lab, Physics, AMES, Iowa, United States
Matt W. Graham
Affiliation:
werd@berkeley.edu, Berkeley, Chemsitry, Berkeley, California, United States
Yingzhong Ma
Affiliation:
may1@ornl.gov, Berkeley, Chemsitry, Berkeley, California, United States
Graham R. Fleming
Affiliation:
fleming@cchem.berkeley.edu, Berkeley, Chemsitry, Berkeley, California, United States
Robert A Kaindl
Affiliation:
RAKaindl@lbl.gov, Berkeley, Materials Sciences Div., Berkeley, California, United States
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Abstract

We present femtosecond mid-infrared (mid-IR) studies of the broadband low-energy response of individualized (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed in these semiconducting tubes around 200 meV photon energy. The transition energy and broadly sloping spectral shape are characteristic of quasi 1D intra-excitonic transitions between different relative-momentum states. Our result yields a value of the intra-excitonic absorption cross section of σ∥MIR≈4×10-5.

Keywords

Cnanostructurelaser
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1230: Symposium MM – Ultrafast Processes in Materials Science , 2009 , 1230-MM02-04
Copyright
Copyright © Materials Research Society 2010

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