Molecular design of azo-carbazole monolithic dyes for updatable full-color holograms

Abstract

For the use of updatable full-color holography in practical applications, azo-carbazole (ACzE) monolithic dyes dispersed in poly (methyl methacrylate) (PMMA) films with high diffraction efficiency, write/delete capabilities and transparency are of extreme importance. We synthesized seven types of novel ACzE monolithic dyes and examined the influence of substituents introduced in the para position of the phenyl ring and the distinct strength of the substituents (NO 2 : NACzE, CN: CACzE, CH 3 CO: AACzE, F: FACzE, CH 3 O: MACzE, OH: HACzE and NH 2 : AmACzE) on the phenyl ring of the ACzEs. Spectroscopic and holographic optical properties, including absorption coefficient α, wavelength dependence of diffraction efficiency η, response time τ, the thickness of the recorded gratings d, the Bragg angle ΔW and the Q-factor, required for the optimization of updatable full-color holograms were investigated. On the basis of the spectroscopic and holographic optical results, the appropriate writing/reading beams were determined as follows: 561/4600 nm for NACzE, 532/4560 nm for CACzE (and AACzE), 491/4530 nm for MACzE (and HACzE). According to the spectroscopic and holographic optical results, we propose here an insight designed to allow updatable full-color holography using ACzEs, and demonstrate a multi-color hologram in MACzE/PMMA.

Compact And Scalable Large Vortex Array Generation Using Azocarbazole Polymer And Digital Hologram Printing Technique

“…Such a two beam recording can be performed using the currently reported optical system with minimal modification. Diffraction efficienciency of 68% has been reported for the same azocarbazole sample for such a two beam hologram recording at a wavelength of 532 nm [22]. Since only the +1 diffraction order is present while reconstructing a volume hologram, there will be no overlap (with +2 nd and higher orders) which helps in increasing the number of vortices in array.…”

Holographic Performance of Azo-Carbazole Dye-Doped UP Resin Films Using a Dyeing Process

“…The 3-[(4-cyanophenyl)azo]-9 H -carbazole-9-ethanol (CACzE) was synthesized according to a previously reported procedure [3]. Figure 1 shows the structural formula of CACzE and a photograph of the CACzE powder.…”

“…Polymer-based dynamic holographic films have attracted considerable attention as a next-generation 3D display technology [1,2,3,4,5,6,7]. Optical transparency and an enlarged sample size with a uniform dispersion of the dye and no air bubbles are the minimum requirements for the practical application of dynamic holograms [3]. In our 2016 report [3], we proposed insightful scientific research to allow transparency in the visible region for the azo-carbazole analog based on spectroscopic and holographic optical perspectives.…”

“…Optical transparency and an enlarged sample size with a uniform dispersion of the dye and no air bubbles are the minimum requirements for the practical application of dynamic holograms [3]. In our 2016 report [3], we proposed insightful scientific research to allow transparency in the visible region for the azo-carbazole analog based on spectroscopic and holographic optical perspectives. Melt-pressed poly(methyl methacrylate) (PMMA) films dispersed with azo-carbazole dyes give high optical transparency with a uniform coloring state and no air bubbles.…”

Methoxy and Hydroxy Triphenylamine-Based Azo Dyes: Synthesis and Photophysical Properties on Polyester and Nylon Fabrics

“…[7][8][9] The photophysical properties of azo dyes are dependent on the donor and acceptor groups and strength of the substituents present on either side of the azo system. 10 Various donor groups such as carbazole, 11 phenol, 12 and N,N-diethylaniline are used in azo dye synthesis. However, in spite of their wide application in organic light emitting devices, dye sensitized solar cell, non-linear optics, and metal sensing, [13][14][15][16] few triphenylamine-based azo dyes have been reported as nonlinear optical materials.…”