Abstract
We study the photo-induced transmission change (Delta T/T) upon
quasi-continuum laser excitation, for different modulation frequency and
excitation intensity in films of (6, 5) enriched CoMoCat single wall
nanotubes (SWNTs) embedded in a polymeric matrix. This technique probes
long-lived excited species, with lifetime in the 1 ms-1 s domain. The
observed line-shape of Delta T/T spectra that can be assigned to a
superposition of ground state bleaching and absorption modulation. We
speculate that photo-excitation creates charges which get trapped in the
sample, acquiring ms lifetime. This causes bleaching of the ground state
absorption due to state filling and possibly a tube diameter expansion,
with consequent blue shift of the optical transition.
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