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Direct comparison of mechanical and electro-optic responses of a low Tg photorefractive doped polymer (2002)

Ribierre, J.-C. ; Cheval, G. ; Huber, F. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 91 (2002), S. 1710-1712

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The temperature dependence of the electro-optic responses in a low glass transition temperature (Tg) photorefractive polymer was investigated using an ellipsometric technique. The sample was composed of a carbazole functionalized polysiloxane doped with a push–pull chalcone derivative. The results provide information on the orientational dynamics of the chromophores doping the polymer host. For this purpose, the electro-optic response is directly compared, for different temperatures above Tg, to dynamic shear compliance measurements characterizing the mechanical macroscopic behavior of the material. We demonstrate here that these orientational processes are entirely ruled by the mechanical properties of the material. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1428788

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Ellipsometric measurements of the polarizability anisotropies of push–pull molecules in solution (1998)

Fort, A. ; Muller, J. ; Cregut, O. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 83 (1998), S. 2888-2893

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: We have developed an experimental setup for the measurement of the polarizability anisotropy of push–pull molecules in solution. We have used this technique to investigate prototype push–pull molecules that have been incorporated as doping chromophores in low glass transition temperature photorefractive polymers. Results obtained evidence for these compounds that the refractive index modulation is dominated by the orientational birefringence contribution while the electro-optic contribution remains small. © 1998 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.367075

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High net gain at 514 nm in a photorefractive polymer doped with a chalcone derivative (1997)

Mager, L. ; Melzer, C. ; Barzoukas, M. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 71 (1997), S. 2248-2250

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We report on the photorefractive properties of a low Tg composite consisting of functionalized polysiloxane doped with a chalcone derivative. The high transparency of this doping molecule enabled the observation of high net gain at 514 nm. Orientational and Pockels contributions to the total refractive index variations were measured by frequency-dependent ellipsometry experiments. Finally, the field dependence of the gain coefficient is described using Kukhtarev's model for the space charge field with an effective trap density as a single fitting parameter. © 1997 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.120040

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