Photonic Bandgap Composites

Foulger, Stephen H.; Jiang, Ping; Ying, Yurong; Lattam, Amanda C.; Smith, Dennis W.; Ballato, John

doi:10.1002/1521-4095(200112)13:24<1898::aid-adma1898>3.0.co;2-v

Cited by 106 publications

(79 citation statements)

References 17 publications

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“…Th is experimental approach has recently been extended to other ordinary materials for practical applications. For instance, highly stable colloidal crystals have been permanently trapped in crosslinked polymer hydrogels as a basis for the development of color-changing sensors and lasers [13][14][15][16]. More recently, polymerizable liquids have been introduced as media for colloidal crystals.…”

Section: Colloidal Crystalsmentioning

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: Colloidal Crystalsmentioning

confidence: 99%

Self-assembled colloidal structures for photonics

et al. 2011

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“…The nonclose-packed colloidal crystals have an attractive feature as photonic crystals that the distance between particles is tunable [1,2]. They are created by use of various methods [3][4][5][6][7][8][9][10], e.g., shear-annealing, controlling the temperature gradient, and controlling the pH gradient.…”

Section: Introductionmentioning

confidence: 99%

Effect of container shape and walls on solidification of Brownian particles in a narrow system

et al. 2014

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We carry out Brownian dynamics simulations and study the ordering of particles under a uniform external force in a narrow system. In our previous studies [M. Sato et al., Phys. Rev. E 87, 032403 (2013); J. Phys. Soc. Jpn. 82, 084804 (2013)], we showed that the ordering of particles depends on the direction of the external force. In the studies, however, the system size and the number of particles are small, so the behaviors we observed corresponds to the motions in the initial stage of crystallization. In this paper, using a longer container and more particles, we investigate how solidification in a narrow system proceeds. We also study the effect of the shape of simulation box on the ordering of particles. When we use a rhomboid as a simulation box, the ratio of the particles with the face-centered cubic structure to those with the hexagonal close-packed structure is larger than that in a cuboid system.

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“…Some examples of these stimuli include heat, [1][2][3][4][5][6][7][8][9] deformation, [10][11][12][13][14][15][16][17][18][19][20] chemicals, [21][22][23] light, [24][25][26] and others, [27,28] which make the sensors useful for a wide range of technologies. [29,30] We recently reported on a new class of polymers with built-in optical deformation [31][32][33][34][35] and threshold temperature [33,34,36] sensors.…”

Section: Introductionmentioning

confidence: 99%

Threshold Temperature Sensors with Tunable Properties

Crenshaw

Kunzelman

Sing

et al. 2007

Macro Chemistry & Physics

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Thermochromic polymer/dye blends based on small amounts (0.6–2.3 wt.‐%) of chromogenic sensor dyes and glassy amorphous polymers were prepared. Subjecting melt‐processed, quenched blends to temperatures above Tg leads to permanent and pronounced changes of their absorption and fluorescence spectra as a result of phase separation and assembly of dye aggregates. The influence of dye structure and polymer Tg on the aggregation kinetics of these blends was investigated. It is shown that increasing the length of the dye's rigid core leads to slower aggregation rates due to limited mobility in the polymer. The threshold of the color change can be tailored by adjusting the polymer Tg, as was shown by the systematic investigation of blends based on poly(alkyl methacrylate) copolymers of varying composition.magnified image

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Photonic Bandgap Composites

Cited by 106 publications

References 17 publications

Self-assembled colloidal structures for photonics

Self-assembled colloidal structures for photonics

Effect of container shape and walls on solidification of Brownian particles in a narrow system

Threshold Temperature Sensors with Tunable Properties

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