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Abstract
Reflective holographic polymer dispersed liquid crystals(HPDLCs) have been fabricated with a ternary monomer system composed of dipentaerythritol hydroxy penta acrylate(DPHPA)/trimethylol propane triacylate(TMPTA)/N-vinylpyrrolidone(NVP)=7/2/1 by weight. Gratings were written by irradiating with an Ar-ion laser(λ=488 nm) at various intensities(20–200 mW/cm2) on LC/monomers composite films of various composition(25/75, 30/70, 35/65, 38/62, 40/60). Polarized optical micrography(POM) images of gratings and UV-visible spectra were taken and reflection efficiency-irradiation intensity-film composition relatioriships are subsequently obtained in three dimensional plot which showed that maximum reflection moves from high LC content (38wt%) at low irradiation intensity (20 mW/cm2) to low LC content(25wt%) at high irradiation intensity (200 mW/cm2).