Switchable Photonic Crystals Using One-Dimensional Confined Liquid Crystals for Photonic Device Application

Ryu, Seong Ho; Gim, Min-Jun; Lee, Won Suk; Choi, Suk–Won; Yoon, Dong Ki

doi:10.1021/acsami.6b15361

Cited by 48 publications

(21 citation statements)

References 60 publications

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“…Another case of an inorganic photonic crystal infiltrated with an azobenzene‐doped LC has been reported by Ryu et al, where the structure is a modulated 1D anodic aluminum oxide with a periodic alternation of branched and straight regions along nanopores in the aluminum oxide. After infiltration with a photoresponsive LC (E7 doped with BMAB), the position of the bandgap mode was switched from 695 to 702 nm when the sample was exposed to UV light.…”

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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“…Liquid crystals (LCs) containing an azobenzene moiety, either of low molar mass or polymeric in nature, have attracted tremendous attention as a result of their light-induced, photo-switchable, and elastic properties [4][5][6]. The introduction of reversible trans-cis photoisomerization of azobenzene can exert large effects on the properties of LCs [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Photo-Responsive Thermotropic Liquid Crystals Based on Azobenzene

et al. 2018

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A series of new thermotropic liquid crystals (LCs) containing azobenzene units was synthesized. The structures of the compounds were characterized by means of NMR and FTIR spectroscopy. Their mesomorphic behaviors were investigated via differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Based on the POM and DSC measurements, the optical properties of the Razo-ester were tested using UV-vis spectroscopy. The azobenzene side chain displayed a strong ability to influence the formation of thermotropic LCs.

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“…[11][12][13] In recent decades, azobenzene based low and high molecular weight liquid crystalline materials have been frequently discussed for their sensitivity of chromophoric group towards light and found to exhibit interesting optical properties, which enable us to study the materials in holography, optical storage device, optical switching and establish widespread applications in display technology. [14][15][16][17][18][19] On the other hand, chalcones are the main precursors for the biosynthesis of avonoids and isoavonoids. A variety of organic molecules with chalcone moiety have been evaluated for pharmacological applications due to their good antimicrobial, 20 nematocidal, 21 anticancer 22 and antiplasmodial 23 activities.…”

Section: Introductionmentioning

confidence: 99%