[MOS] Shin Grace Chou, MIT, November 30, 2004

[Vinnie Russo]

Dear Colleagues,

The G.R. Harrison Spectroscopy Laboratory and the Department of Electrical 
Engineering and Computer Science would like to invite you to the next 
seminar in our series on Modern Optics and Spectroscopy.


Date & Time:            Tuesday, November 30, 12 noon - 1 PM
Location:               Grier Room (34-401)
Speaker:                Shin Grace Chou, Massachusetts Institute of Technology
Title:                  The novel photophysics in DNA-wrapped carbon nanotubes

Refreshments will be served following the talk.

Abstract:
Shin Grace Chou, Massachusetts Institute of Technology
The novel photophysics in DNA-wrapped carbon nanotubes
We have carried out a detailed resonance Raman and photoluminescence (PL) 
spectroscopic study on a (6,5)-enriched single wall carbon nanotube sample 
that has been dispersed and isolated using single stranded DNA.  Multiple 
intense PL peaks are observed at excitation energies that do not correspond 
to singularities in electronic density of states, where resonantly enhanced 
optical transitions occur.  The observed PL peaks are assigned to different 
mechanisms of excitonic excitation and relaxation, including one-phonon, 
two-phonon, and hot luminescence processes, as well as radiative and 
non-radiative energy transferring mechanisms between neighboring 
nanotubes.  The study shows that the excitonic relaxation processes 
observed in photoluminescence spectra can be used as a means of probing the 
different physical interactions between photons, carriers, and phonons that 
are not separately identified in bulk semiconductor materials.

Vinnie Russo * vrusso at mit.edu  *  Office Manager
MIT; G.R. Harrison  Spectroscopy Laboratory
77 Mass. Ave., 6-014  *  Cambridge, MA  02139
(v) 617-253-9774  *  (f) 617-253-4513

Vinnie Russo * vrusso at mit.edu  *  Office Manager
MIT; G.R. Harrison  Spectroscopy Laboratory
77 Mass. Ave., 6-014  *  Cambridge, MA  02139
(v) 617-253-9774  *  (f) 617-253-4513 
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