TITLE

Double walled carbon nanotubes as ultrafast optical switches

AUTHOR(S)
Kamaraju, N.; Kumar, Sunil; Kim, Y. A.; Hayashi, T.; Muramatsu, H.; Endo, M.; Sood, A. K.
PUB. DATE
August 2009
SOURCE
Applied Physics Letters;8/24/2009, Vol. 95 Issue 8, p081106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Pristine and molybdenum filled double walled carbon nanotubes (DWNTs) suspended in D2O show excellent ultrafast optical switching properties investigated through femtosecond Z-scan and degenerate pump-probe method using 50 fs pulses with central photon energy of 1.57 eV. For pristine-DWNT, the two photon absorption coefficient, β and nonlinear refraction coefficient, n2 are 4.9×10-8 cm/W, and 9.5×10-11 cm2/W, respectively, which yield one photon figure of merit, W=133 and two photon figure of merit, T=0.4. The degenerate pump-probe measurements show strong photoinduced bleaching with biexponential decay with time constants ∼150 and 600 fs.
ACCESSION #
43944878

 

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