Abstract
We study the behavior of a nanoparticle-polymer composite (NPC) material, based on a thiol-ene monomer system, working with long grating spacing. Thus, we evaluate the suitability of the NPC for storing complex diffractive optical elements with sharp profiles, such as blazed gratings. Using holographic methods, we measure the “apparent” diffusion of the material and the influence of the spatial period on this diffusion. The applicability of this material in complex diffractive optical elements (DOEs) recording is analyzed using an interferometric method. Supported by the results of this analysis, we record blazed gratings with different grating spacing and measure the maximum diffraction efficiency (DE) achieved. The results show that NPC has a good behavior in this range of spatial frequencies.
Highlights
Photopolymerizable nanoparticle-polymer composites (NPCs) are a holographic dry composition in which inorganic nanoparticles, such as TiO2, SiO2, ZrO2, nanozeolites [1,2,3,4,5], and organic nanoparticles [6], are uniformly dispersed in organic host monomers that are capable of chain-growth polymerization.During the polymerization process, a light-induced redistribution of the monomer and nanoparticles takes place in the bright and dark regions of the light pattern, respectively
The different experiments carried out were described in the Introduction
As diffraction efficiency (DE) of diffracted orders in the Fraunhofer domain are given by the Bessel functions [30], a comparison of the different diffracted orders in the Fraunhofer domain are given by the Bessel functions [30], a theoretical DEs with those measured experimentally gives the linearity in the response of the NPC
Summary
Photopolymerizable nanoparticle-polymer composites (NPCs) are a holographic dry composition in which inorganic nanoparticles, such as TiO2 , SiO2 , ZrO2, nanozeolites [1,2,3,4,5], and organic nanoparticles [6], are uniformly dispersed in organic host monomers that are capable of chain-growth polymerization. We found that it was difficult to increase the refractive modulation amplitude due to its large monomer diffusivity, and to reduce polymerization shrinkage during recording for the realization of low spatial frequency diffractive optical elements (DOEs) with sharp profiles. For this reason, we investigate the electro-optic characteristics of DOEs recorded in the NPC material incorporated with liquid crystals in the low spatial frequency regime. This is done by using a liquid crystal on a silicon (LCoS) microdisplay based spatial light modulator (model PLUTO, Holoeye, Berlin, Germany), which is turned into a phase element once projected on the NPC material
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