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- Title
Infrared photorefractive composites based on polyvinylcarbazole and carbon nanotubes.
- Authors
Grishina, A. D.; Licea-Jimenez, L.; Pereshivko, L. Ya.; Krivenko, T. V.; Savel'ev, V. V.; Rychwalski, R. W.; Vannikov, A. V.
- Abstract
Photorefractive materials based on unplasticized polymers that have a high glass-transition temperature and the frozen random orientation of chromophores were prepared by layer casting. Under these conditions, only the third-order susceptibility has a nonzero value, increasing with an increase in the conjugation-chain length and reaching considerable values in the case of nanosized molecules, such as single-wall carbon nanotubes (SWNTs). In SWNT-containing polyvinylcarbazole, the photoelectric sensitivity and photorefractive characteristics were measured at 1064 nm. Using electric-field induced second-harmonic generation, the third-order susceptibility was estimated. In a composite containing 0.26 wt % SWNT, the diffraction grating is displaced by 5° relative to the interference pattern, the result that is presumably due to the close mobility of unlike charge carriers. Therefore, the beam-coupling gain coefficient Γ and the net gain Γ-α have low values, which are 53 and 42 cm−1, respectively, at 115 V/μm.
- Subjects
PHOTOREFRACTIVE materials; ELECTROOPTIC materials; NANOCRYSTALS; PHOTOELECTRICITY; SPECTRUM analysis instruments; DIFFRACTION gratings; NANOTUBES
- Publication
High Energy Chemistry, 2006, Vol 40, Issue 5, p341
- ISSN
0018-1439
- Publication type
Article
- DOI
10.1134/S0018143906050109