Abstract
Recently, a novel holographic diffraction grating made of polymer slices alternated to homogeneous films of nematic liquid crystal (POLICRYPS) was realized. We study the optical performance of the POLICRYPS gratings by both numerical simulations and experiments. Characterization of the grating at normal and conical reading mount are performed. The diffraction efficiency depends strongly on the angles of incidence. Besides, the characterization of the diffraction efficiency at Bragg angle incidence is studied. A uniform high diffraction efficiency is achieved when the incident wave satisfies the Bragg condition.
Highlights
The realization of holographic diffraction gratings in composite materials has been widely investigated in the past 20 years [1, 2]
It has been shown that devices based on holographic polymer dispersed liquid crystals (H-PDLC) have good diffraction efficiency
A new kind of holographic diffraction grating made of polymer slices alternated with homogeneous films of nematic liquid crystal (NLC) was realized, named Polymer Liquid Crystal Polymer Slices (POLICRYPS) [4]
Summary
The realization of holographic diffraction gratings in composite materials has been widely investigated in the past 20 years [1, 2]. It has been shown that devices based on holographic polymer dispersed liquid crystals (H-PDLC) have good diffraction efficiency. Those devices have some intrinsic drawbacks [3] because of the particular droplet structure of the nematic liquid crystal (NLC) formed in such gratings. A new kind of holographic diffraction grating made of polymer slices alternated with homogeneous films of NLC was realized, named Polymer Liquid Crystal Polymer Slices (POLICRYPS) [4]. The standard POLICRYPS grating writing process was performed on a stabilized setup [5]. To avoid the formation of the NLC droplets during the curing process, the syrup of photo-initiatormonomer-NLC mixture has to be heated up above the nematic-isotropic transition temperature of the NLC
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