Ionic liquid as additive to increase sensitivity, resolution, and diffraction efficiency of photopolymerizable hologram material

Abstract

A photopolymerizable glass with diffraction efficiency near 100% for holographic storage Appl.

Photopolymerizable glass with high refractive index species: overview of emerging implementations

“…Contributions on photopolymerizable silica glasses have been also reported for recording of particular transmission holographic gratings such as nonuniform ones by applying the so-called two-wave mixing recording procedure [10]. Also, in 2008 it was reported the synthesis of a photopolymerizable hologram material using ionic liquid as additive in order to increase the sensitivity, resolution and diffraction efficiency [11]. Owing to the challenge of holographic data storage allowing real-time processing a new interesting class of photorefractive material has been reported as a sol-gel material containing a large amount of chromophores [12].…”

Study of holographic diffraction gratings implemented in photopolymerizable glasses incorporating ionic liquid

“…7 In particular, they have been applied to holographic materials based on photopolymers, increasing their refractive index modulation. 8 Additionally, the incorporation of IL results in a controllable light scattering which has been applied to optical diffusers. 9 With the objective of studying the effects of incorporating ionic liquid to photopolymerizable glasses, three different photomaterials were synthesized and characterized by implementing transmission volume holographic diffraction gratings: the previously disclosed photopolymerizable glass incorporating HRIS, synthesized again for comparative purposes; and two photopolymerizable glasses incorporating a specific type of ionic liquid (with and without HRIS respectively).…”

Photopolymerizable glasses incorporating high refractive index species and ionic liquid: A comparative study

“…In the case of the photopolymerizable glass with HRIS, the temporal evolution of Dn after the holographic recording can be modeled using the weighted sum of two exponential functions 20 :…”

“…Additionally, ionic liquids have shown to improve polymerization rates, [17][18][19] an advantage which has already been exploited in holographic materials based on photopolymers. 20 In the preliminary studies done by Lin et al, the incorporation of IL to a photosensitive polymerizable material resulted in an increase of the sensitivity, spatial resolution and refractive index modulation. The strong diffusion mechanism which follows the light exposure, enhanced by the presence of IL, allowed to reach diffraction efficiencies up to 34% for a thin hologram (Raman-Nath regime, 21 10 lm grating thickness).…”