Nanocomposites photonic materials are being actively studied for practical applications such as touch screen, wearable devices, optical sensors, photolithography, and neutron optics. For many of these applications, it is essential to fabricate embedded phase structures into media, in order to implement various properties for its practicality. High-contrast refractive-index changes with promising flexibility are usually desired for these applications. Photopolymers as an appealing candidate are attractive because they hold several advantages, such as low cost, ease of use, shape flexibility, large-area process ability, and self-development capability. In this work, we carried out single-wall nanotube doped polymer composites, which are based on acrylate-thiol-ene photopolymer material. It is shown that a substantial increase in refractive index modulation and diffraction efficiency is realized by doping both of BzO2 and single-wall nanotubes. Moreover, the incorporation of BzO2 lowers the optimum recording intensity to 0.25 mW/cm2. These results indicate that carbon nanotube-polymer composite provides effective method to fabricate flexible films with large-area holograms for wearable devices, display, and optical sensor uses.
Dry photopolymer materials are being actively studied for practical applications such as holographic data storage, 3D display, wearable displays with diffractive optical elements and so on. Their versatility, ease of use and self-processing ability give them many advantages over more traditional recording materials such as silver halide and dichromate gelatin for holographic uses. The necessity for development and optimization of such dry photopolymer diffraction elements with higher capability and stability has been recognized and they have recently received significant attention in the areas of holographic and wearable displays. In this work, we carried out nanoparticles composites, which are based on a SiO2 nanoparticle doped acrylate-thiol-ene photopolymer material, in order to fabricate holographic diffraction elements for 3D display uses. Preliminary examination on this material and fabrication techniques shows that a flexible free-standing volume grating with thickness of 200 μm and grating period of 1 μm was fabricated by using proposed nanoparticle composite material in the recording wavelength of 532 nm. The examination on thinner material layers with varied nanoparticles, such as in the range of 10 μm, is undergoing. We believe that such holographic diffraction elements offer a significant potential in display technique.