Nanoscale optical reinforcement for enhanced reversible holography

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

doi:10.1364/oe.20.003091

Cited by 13 publications

(6 citation statements)

References 33 publications

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“…Composites containing polymers with azobenzene side chains and small‐molecule LCs have been used more recently by Wu et al in a rewritable holographic medium where the azobenzene moieties drive the orientation of the LC molecules in bright regions. This increases the order of the polymer chains, which improves the stability of the hologram relative to the case when only the azo‐polymer or LC is used.…”

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

“…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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“…Moreover, these materials can be readily scalable for manufacturing large-size panels. Many research groups have thus been working on exploiting new materials such as photorefractive polymers, photorefractive liquid crystal, etc [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Highly photorefractive hybrid liquid crystal device for a video-rate holographic display

Xiang

et al. 2016

Opt. Express

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In this paper, we demonstrate a dynamic holographic display in a quantum dot (ZnS/InP) doped liquid crystal device, where one of the interior cell surfaces is covered by a ZnSe layer. Such a hybrid device shows substantially improved photorefractive sensitivity of 2.2 cm³/J, which is almost 300 times larger than that in ZnS/InP doped liquid crystal device without the ZnSe layer. The holographic grating can form at intensities as low as ~0.8 mW/cm², and exhibit a fast optical response of several to tens of milliseconds. Exploiting the superior performances of photosensitivity and fast response of this device, we obtain dynamic holographic videos of red, green, and blue colors, as well as a reconstructed image of high gray-scale fidelity.

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Nanoscale optical reinforcement for enhanced reversible holography

Cited by 13 publications

References 33 publications

Photoresponsive Structural Color in Liquid Crystalline Materials

Photoresponsive Structural Color in Liquid Crystalline Materials

Recent advances in holographic recording media for dynamic holographic display

Highly photorefractive hybrid liquid crystal device for a video-rate holographic display

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