Angle‐Independent Structural Color in Colloidal Amorphous Arrays

Harun‐Ur‐Rashid, Mohammad; Imran, Abu Bin; Seki, Takahiro; Ishii, Masahiko; Nakamura, Hiroshi; Takeoka, Yukikazu

doi:10.1002/cphc.200900869

Cited by 162 publications

(176 citation statements)

References 30 publications

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“…Whereas photonic crystals can be used in the precise manipulation of ballistic photons, photonic glasses are useful in the control of light diff usion. Th e random structures of designed uniform colloids can interact strongly with light and thus produce unusual diff usion phenomena including random lasing, angle-independent color and light localization [30][31][32][33][34][35][36]. Th ese disordered monodisperse colloidal particle structures and short-rangeordered colloidal structures have been produced by controlling the salt concentration in order to destabilize the colloidal particles or by adding smaller colloidal particles [37].…”

Section: Photonic Glassesmentioning

confidence: 99%

Self-assembled colloidal structures for photonics

et al. 2011

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A s dielectric structures with a submicrometer length scale can interact strongly with light, various remarkable optical responses can be designed and tailored depending on the types and parameters of their structures. Over the past few decades, the unusual optical properties of the periodic dielectric structures called photonic crystals have been investigated intensively [1]. Many research groups have endeavored to engineer the optical properties of photonic crystals, including photonic bandgaps, 'slow' photons, negative refraction and other properties, or to use them in practical applications. Two-dimensional (2D) structures, which are mostly prepared by conventional lithographic processes, were demonstrated initially, in which total internal refl ections were adopted for confi ning the light in a nonperiodic third direction, and their use has been investigated in some limited applications [2]. Th ree-dimensional (3D) structures have also been investigated intensively because of their complete photonic bandgaps in certain structures, a critical property for controlling light in 3D space. Research on such structures has been supported by the recent development of facile fabrication methods, including the selfassembly of simple monodisperse particles, also known as colloidal self-assembly [3], block copolymer self-assembly [4], the auto-cloning process [5] and holographic lithography [6]. Of these methods, colloidal self-assembly is the most promising for the low-cost production of 2D and 3D photonic crystals over large areas or with various shapes [7,8]. Schematic diagrams of the basic colloidal crystal structure along with inverse and short-range-ordered scattering structures for photonic applications are shown in Figure 1. Disordered dielectric structures of monodisperse particles called photonic glasses have begun to be investigated as another class of photonic nanostructures that can manifest some unusual optical phenomena such as random lasing, strong light localization and long-range intensity correlations. In this review article, we describe self-assembled colloidal photonic nanostructures in brief and summarize recent achievements in the fi eld of colloidal photonic nanostructures and their applications. Fabrication of photonic nanostructures by colloidal assembly Colloidal crystalsSince Vanderhoff 's serendipitous discovery of a synthetic method for preparing monodisperse polymer colloids [9], the method has been extended to the preparation of a variety of polymeric colloids and also to the processing of inorganic colloidal particles such as silica, titania and iron oxide. As long as particles are stable in liquid and their size distribution is suffi ciently narrow, they can be crystallized in a facecentered cubic (fcc) lattice by increasing their volume fraction through any concentration process, such as controlled evaporation, sedimentation or fi ltration. In general, the interparticle forces can be described by summing over the various potentials from diff erent origins, including intermolecular for...

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Section: Photonic Glassesmentioning

confidence: 99%

Self-assembled colloidal structures for photonics

et al. 2011

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“…In contrast to amorphous 'opal' nanostructures of synthesized dielectric spheres featured in contemporary engineering approaches [75,[78][79][80], the spongy feather barbs possess an amorphous 'inverseopal' nanostructure, which is likely to possess better optical properties than their 'opal' counterparts, by analogy to photonic crystals [6]. Indeed, the optical properties of feather barbs currently surpass those of engineered amorphous colloidal photonic materials [51].…”

Section: Biomimicry Lessons For Amorphous Photonicsmentioning

confidence: 99%

Structure and optical function of amorphous photonic nanostructures from avian feather barbs: a comparative small angle X-ray scattering (SAXS) analysis of 230 bird species

Saranathan

Forster

Noh

et al. 2012

J. R. Soc. Interface.

142

185

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Non-iridescent structural colours of feathers are a diverse and an important part of the phenotype of many birds. These colours are generally produced by three-dimensional, amorphous (or quasi-ordered) spongy b-keratin and air nanostructures found in the medullary cells of feather barbs. Two main classes of three-dimensional barb nanostructures are known, characterized by a tortuous network of air channels or a close packing of spheroidal air cavities. Using synchrotron small angle X-ray scattering (SAXS) and optical spectrophotometry, we characterized the nanostructure and optical function of 297 distinctly coloured feathers from 230 species belonging to 163 genera in 51 avian families. The SAXS data provided quantitative diagnoses of the channel-and sphere-type nanostructures, and confirmed the presence of a predominant, isotropic length scale of variation in refractive index that produces strong reinforcement of a narrow band of scattered wavelengths. The SAXS structural data identified a new class of rudimentary or weakly nanostructured feathers responsible for slate-grey, and blue-grey structural colours. SAXS structural data provided good predictions of the singlescattering peak of the optical reflectance of the feathers. The SAXS structural measurements of channel-and sphere-type nanostructures are also similar to experimental scattering data from synthetic soft matter systems that self-assemble by phase separation. These results further support the hypothesis that colour-producing protein and air nanostructures in feather barbs are probably self-assembled by arrested phase separation of polymerizing b-keratin from the cytoplasm of medullary cells. Such avian amorphous photonic nanostructures with isotropic optical properties may provide biomimetic inspiration for photonic technology.

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“…To create amorphous structures from colloidal assemblies, simple evaporation, centrifugation, drop-casting, spin-coating and spray coating techniques have been commonly employed. [19][20][21][22][23][24][25][26][27][28][29][30] For example, we successfully prepared colorful coatings consisting of an amorphous array using mixtures of two different sizes of SiO 2 particles by the simple evaporation method. 20 In addition, we fabricated a colloidal amorphous array of SiO 2 particles by spray coating.…”

Section: Introductionmentioning

confidence: 99%

Structural color coating films composed of an amorphous array of colloidal particles via electrophoretic deposition

et al. 2017

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It is desirable to fabricate colorful coatings that have nonfading properties and are environmentally friendly. In this study, a novel approach for creating structural color coatings from monodisperse silica particles is presented. The structural color coating films, formed from an array of silica particles with a small amount of black additive, are easily prepared by a simple electrophoretic deposition (EPD) technique. The arrangement of the particle array is controlled by varying the applied voltage and deposition time. The iridescence, that is, the angular dependence, of the structural color dramatically changes with the arrangement of the particle array. A variety of colored coatings can be produced by changing the size of the particles. Structural color coatings on materials with curved surfaces and complicated shapes are also achieved by the EPD method.

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Angle‐Independent Structural Color in Colloidal Amorphous Arrays

Cited by 162 publications

References 30 publications

Self-assembled colloidal structures for photonics

Self-assembled colloidal structures for photonics

Structure and optical function of amorphous photonic nanostructures from avian feather barbs: a comparative small angle X-ray scattering (SAXS) analysis of 230 bird species

Structural color coating films composed of an amorphous array of colloidal particles via electrophoretic deposition

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