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8 June 2005 Expanding the spatial resolution of acrylic films for data storage applications
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Noticeable refractive index modulations (difference between the refractive index of high-density areas and the index of low-density areas ~8x10-3) can be created by photostructuration of acrylic films. The light pattern created by the interference of two plane waves induces inhomogeneous polymerization and mass diffusion processes, due to concentration gradients of monomer and dye, giving rise "in situ" to a structuration of the material at the microscopic scale. As the species involved in the initiation mechanism are gradually consumed as the hologram builds up, the incident dose is determined in order to reach full completion of the reaction at the end of the recording, i.e. to obtain stable gratings. This property makes photopolymers attractive materials for number of applications, especially in holography. A great advantage of these materials over other recording systems is that no chemical or heating post-treatment is required after illumination to reveal the hologram. Diffraction efficiencies of ca 80 % were obtained at 514 nm for transmission holograms with a fringe spacings between 0.2 and 5 μm. 675 mJ/cm2 corresponding to a bleaching of the dye of 85% allows non-destructive reading at an active wavelength (green light). Miscellaneous photonic parameters (chemical composition, intensity, dose...) were tested by grating recording. Taking into account all these data, improvement of the material is possible in view of data storage applications.
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S. Jradi, C. Croutxe-Barghorn, and C. Carre "Expanding the spatial resolution of acrylic films for data storage applications", Proc. SPIE 5827, Opto-Ireland 2005: Photonic Engineering, (8 June 2005);

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