Infrared photorefractive composites based on polyvinylcarbazole and carbon nanotubes |
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Authors: | A D Grishina L Licea-Jimenez L Ya Pereshivko T V Krivenko V V Savel’ev R W Rychwalski A V Vannikov |
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Institution: | 1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia 2. Department of Materials Science and Engineering, Chalmers University of Technology, SE-41296, G?teborg, Sweden
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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. |
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