Title
Asymmetric dyes align inside carbon nanotubes to yield a large nonlinear optical response Asymmetric dyes align inside carbon nanotubes to yield a large nonlinear optical response
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Sciences. Physics
Faculty of Sciences. Mathematics and Computer Science
Publication type
article
Publication
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
Nature nanotechnology
Volume/pages
10(2015) :3 , p. 248-252
ISSN
1748-3387
ISI
000350799700016
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Asymmetric dye molecules have unusual optical and electronic properties(1-3). For instance, they show a strong second-order nonlinear optical (NLO) response that has attracted great interest for potential applications in electro-optic modulators for optical telecommunications and in wavelength conversion of lasers(2,3). However, the strong Coulombic interaction between the large dipole moments of these molecules favours a pairwise antiparallel alignment that cancels out the NLO response when incorporated into bulk materials. Here, we show that by including an elongated dipolar dye (p,p'-dimethylaminonitrostilbene, DANS, a prototypical asymmetric dye with a strong NLO response(4)) inside single-walled carbon nanotubes (SWCNTs)(5,6), an ideal head-to-tail alignment in which all electric dipoles point in the same sense is naturally created. We have applied this concept to synthesize solution-processible DANS-filled SWCNTs that show an extremely large total dipole moment and static hyperpolarizability (beta(o) = 9,800 x 10(-30) e.s.u.), resulting from the coherent alignment of arrays of similar to 70 DANS molecules.
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Handle