Enhanced non-volatile and updatable holography using a polymer composite system

Wu, Pengfei; Sun, Sam Q.; Baig, Sarfaraz; Wang, Michael R.

doi:10.1364/oe.20.006052

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…The hologram can be erased thermally or by using the writing beam at high intensity. The same composite materials could also be recorded using a two‐wavelength scheme where the sample was illuminated uniformly by a 532 nm polarized beam (to drive the azobenzene trans – cis isomerization) and by the interference pattern of two 659 nm beams (to reorient the azobenzene molecules in the bright regions). Holograms written by this approach were found to be stable for months in ambient conditions, but could be erased optically or thermally.…”

Section: Directed Self‐assembly Of Liquid Crystalline Materialsmentioning

confidence: 99%

Photoresponsive Structural Color in Liquid Crystalline Materials

McConney

Rumi

Godman

et al. 2019

Advanced Optical Materials

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and then impinging on our eyes. Our brain, rightly or wrongly, interprets these and other sensed patterns as reality. Hence, the saying, "seeing is believing."Given that much of our perceived reality is the result of light-matter interactions, it is no surprise that humans have been actively pursuing methods to understand and control the appearance of materials for thousands of years. Through mixing natural dyes of primary colors, people were able to tailor the color of everyday objects by changing their spectral absorption. The science of absorption-based colored materials evolved to the point of creating materials with light-responsive absorption (photochromics) that, when combined with a camera, were used to capture scenes, thereby allowing us to recreate and share moments of reality. Despite huge advances in the ability to control objects' absorptive color over the last 200 years through chemistry, controlling objects' structural color is still quite challenging. Structural color often refers to spectral interference effects associated with periodic spatial changes in the refractive index of materials (sometimes referred to as photonic crystals). These socalled photonic materials are a unique class of materials that have the ability to strongly affect the light-matter interactions for wavelengths on the scale of the refractive index periodicity. Photonic materials have particularly vivid colors that emerge from their angularly sensitive spectral reflections. Some of the early studies in this area were performed on natural photonic materials that caught the eye of curious scientists. [1] There are many examples of naturally occurring self-assembled photonic materials, including opals, [2] Pollia fruit, [3] jeweled beetles, [1,4] chameleons, [5] and others. [6] These natural examples of structurally derived color can be emulated, altered, or reproduced by researchers. [7][8][9] The ability of biology to self-assemble materials with complex structures and functionality is still unrivaled by engineered systems, but unique opportunities now exist for major advances in autonomously adaptive materials, as scientists are deciphering the molecular mechanisms that biology uses to self-assemble amazingly complex adaptive systems. [10] Particularly relevant to this review, some of the photonic structures found in nature are able to change periodicity in Photoresponsive liquid crystalline photonic materials are a medium in which the self-regulation of light can occur. Liquid crystals are macroscopically selfassembling, optically anisotropic materials capable of amplifying photochemical changes and thus are well suited to demonstrate complex light-driven behavior. This review presents recent progress in liquid crystalline systems exhibiting photoresponsive structural color. More specifically, it surveys progress on liquid crystalline materials and structures with coloration that is the result of the constituents' spatial arrangement (not of presence of dyes or pigments) and for which this arrangement can be externally cont...

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Section: Directed Self‐assembly Of Liquid Crystalline Materialsmentioning

confidence: 99%

Photoresponsive Structural Color in Liquid Crystalline Materials

McConney

Rumi

Godman

et al. 2019

Advanced Optical Materials

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show abstract

“…An enhanced non‐volatile and updatable hologram was reported in a hybrid composite consisting of a liquid crystalline (LC) molecule and azobenzene copolymer . In addition to a coherent object beam and a reference beam at 659 nm, simultaneous illumination of incoherent and broadband short‐wavelength light source at 532 nm (or any color in green or blue wavelength regions) played a key role in inducing photoisomerization from trans isomer to cis isomer of azo‐chromophores.…”

Section: Optical Applicationsmentioning

confidence: 99%

“…Alternative conventional heating can also increase the sample temperature above T g . In this hybrid composite, the polymer chain is reconfigurable due to the molecular orientation of attached azo‐chromophores and the surrounding LC molecules are oriented collectively anchoring towards the reconfigured polymer chains, resulting in a marked enhancement of holographic grating formation …”

Section: Optical Applicationsmentioning

confidence: 99%

Recent advances in photorefractive and photoactive polymers for holographic applications

Tsutsumi

2016

Polymer International

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The current state-of-the-art of photorefractive and photoactive polymers for holographic applications is summarized and reviewed. Photorefractive polymers and some kinds of photoactive materials based on the azobenzene chromophore have great potential for updatable holographic applications. Updatable three-dimensional holographic displays of large size have been developed using photorefractive polymers as well as photoactive azobenzene materials. Time responses of photorefractive polymers of the order of seconds and hundreds of milliseconds are currently improved to be of the order of milliseconds to hundreds of microseconds with high diffraction efficiency and high optical gain.

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“…of Miami introduced a polymer-liquid crystal (LC) colloid-like material [25,26]. It has a quite unique configuration in that the azobenzene side-chained methacrylate-aliphatic copolymers are dispersed within the fluid LCs.…”

Section: Azobenzene Side-chained Copolymer:lc(e63)mentioning

confidence: 99%

Recent advances in holographic recording media for dynamic holographic display

Chen¹,

Su²,

Jhun³

2014

J Opt Photonics

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An overview of the recent advances in the state-of-the-art holographic recoding media dedicated to the dynamic holography display is presented in this paper. Unlike the traditional holographic media, those materials enable the holograms to be updatable rather than permanent like before. Over the past few years, a number of material recipes for this use have been disclosed and can be mainly divided into four classesphotorefractive/photochromic polymers and photorefractive/photochromic liquid crystals. Focusing on five key material properties related to the display application, including diffraction efficiency, applied electric field, recording intensity, rise time and memory, the important findings as well as the underlying mechanisms are unraveled with in-depth discussion. Moreover, a comparison of the four classes of materials is provided, followed by a projection of the potential challenges.

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Enhanced non-volatile and updatable holography using a polymer composite system

Cited by 6 publications

References 29 publications

Photoresponsive Structural Color in Liquid Crystalline Materials

Photoresponsive Structural Color in Liquid Crystalline Materials

Recent advances in photorefractive and photoactive polymers for holographic applications

Recent advances in holographic recording media for dynamic holographic display

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