Highly concentrated phenanthrenequinone – polymethylmethacrylate composite for thick reflection holograms recording at 532 nm

Multiplexed holograms in phenanthrenequinone–polymethylmethacrylate composite for microscopic applications

“…Multiplexed thick reflection holograms in PQ-PMMA composite were recently reported [11]. For a relatively wide range of the recording angles (5 ÷ 15°) an angular selectivity better than 1° could be shown for each of the multiplexed holograms.…”

“…Holographic layers (100 μm thick) were prepared by pouring the liquid solution of PMMA and PQ (3 mol.%) on a glass substrate with subsequent drying. To analyze an ability of the material to record angular multiplexed holograms the Denisyuk experimental set-up was used as described in [11]. Diffracted intensity and angular selectivity curves were measured at λ = 532 nm laser irradiation, which is in the absorption band of PQ-PMMA material (from UV up to 540 nm [11]).…”

“…These highly-concentrated PQ-PMMA layers with 100 μm thickness have demonstrated the effective recording of transmission and reflection holograms [8,9] as well as the formation of the waveguiding structures [10] exposing with an Argon laser (at 488 and 514.5 nm). Recently we discussed in details the formation of stable phase reflection holograms in highly-concentrated PQ-PMMA layers [11]. Three main stages were included: 1) holographic recording by exposing with the interfering light; 2) thermal treatment to increase the diffraction efficiency; and 3) uniform light treatment, to make the hologram insensitive to further light exposure.…”

SiO2 NPs-PQ/PMMA Photopolymer Material Doped with a High-Concentration Photosensitizer for Holographic Storage

“…Before the illumination, PQ molecules with different orientations were randomly distributed in the material. When the material is exposed by a linearly polarized wave, dependent on the polarization state, PQ molecules with a certain orientation have a greater chance of reacting with monomers on certain regions [5,19]. The orientation of the PQ molecules that was parallel to the illuminated wave polarization state had a greater chance of reacting.…”

“…PQ/PMMA (phenanthrenequinone-doped poly(methyl methacrylate)) photopolymer has polarization sensitivity, controllable thickness, good optical quality, and low shrinkage (contraction coefficient < 10 −5 ), all of which make it suitable as a holographic storage material for multidimensional storage [2][3][4]. However, due to the low PQ saturation concentration dissolved in MMA and to the poor photosensitivity associated with a limited quantum of PQ molecular reactions [5], PQ/PMMA is unsatisfactory regarding diffraction efficiency and polarization sensitivity.…”