Abstract
We report on the morphological, spectral and dynamical characterization of one-dimensional transmission holographic volume phase gratings, whose refractive index contrast and nanometric pitch are dynamically controlled by an incident laser light. The grating is obtained by the photo-polymerization of a recently developed photo-mobile holographic composite polymer material. The observed changes in the refractive index contrast and grating pitch strongly suggest that the reversible all-optical real-time modulation of the obtained diffraction efficiency is induced by nano-fluidics.
Highlights
All optically addressable holographic gratings have been studied for a long time
They are usually obtained by mixing azo-benzene-based molecules with holographic polymer dispersed liquid crystal (HPDLCs) materials or with different thermotropic nematic liquid crystals (NLCs) [1,2,3,4,5,6,7,8,9,10,11,12]
An all-optical switching device based on a one-dimensional transmission grating recorded in a SU-8 polymeric substrate infiltrated with a dye-doped liquid crystal was studied
Summary
All optically addressable holographic gratings have been studied for a long time They are usually obtained by mixing azo-benzene-based molecules with holographic polymer dispersed liquid crystal (HPDLCs) materials or with different thermotropic nematic liquid crystals (NLCs) [1,2,3,4,5,6,7,8,9,10,11,12]. Those mixtures are sensitive to the polarization state of an impinging light, which affects the chemical configuration of the active azo-dye molecules present in the mixture. We focus on a novel holographic transmission phase grating whose efficiency is all-optically controllable through reversible light-induced
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