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Kuramochi, Eiichi; Notomi, Masaya; Kawashima, Takayuki; Takahashi, Junichi; Takahashi, Chiharu; Tamamura, Toshiaki; Kawakami, Shojiro

doi:10.1023/a:1013326610166

Cited by 19 publications

(10 citation statements)

References 10 publications

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“…Large water droplets containing SiO2 particles were separated into many small emulsions that kept them spherical on hydrophobic OTS-SAM. Water in the emulsions was gradually extracted to hexane to reduce the size of emulsions forming spherical particle assemblies 27) . After having been immersed for 12 h, spherical particle assemblies with different diameters were observed on OTS-SAM; it was also observed that the assemblies were constructed from various numbers of particles such as 3, 5, 6, 8 or many particles (Fig.…”

Section: Assembly Processmentioning

confidence: 99%

“…Quantities of 3, 5, 6 or 8 particles were assembled into triangular, pyramidal, octahedral or decahedral particle clusters, respectively. The number of particles in spheres can be controlled by the change of emulsion size or particle concentration in water 27) . The spherical shape of particle assemblies was caused by the high contact angle of water emulsion on hydrophobic OTS-SAM in hexane.…”

Section: Assembly Processmentioning

confidence: 99%

“…In the formation process of small clusters of particles (Fig. 4), the water in emulsions dissolved into hexane to reduce droplet size and this restricted the area in which particles could exist 27) . Particles touched together by the reduction of emulsion size and formed a spherically packed assembly.…”

Section: Formation Process Of Small Clusters Of Particlesmentioning

confidence: 99%

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Self-assembly Patterning of Nano/Micro-Particles [Translated]<sup>†</sup>

Masuda

2007

KONA

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We developed a self-assembly process of SiO2 particles to fabricate desired patterns of colloidal crystals having high feature edge acuity and high regularity. A micropattern of colloidal methanol prepared on a self-assembled monolayer in hexane was used as a mold for particle patterning, and slow dissolution of methanol into hexane caused shrinkage of molds to form micropatterns of close-packed SiO2 particle assemblies.We further developed spherical particle assemblies and micropatterns of them. Hydrophilic regions of a patterned self-assembled monolayer were covered with methanol solution containing SiO2 particles and immersed in decalin. Particles were assembled to form spherical shapes and consequently, micropatterns of spherical particle assemblies were successfully fabricated through self-assembly. This result is a step toward the realization of nano/micro periodic structures for next-generation photonic devices by a self-assembly process.Keywords: Self-assembly Patterning, Self-assembly, Colloidal Crystal, Photonic Crystal, Self-assembled Monolayer This report published originally in Japanese in J. Soc. Powder Technology, Japan, 43,362-371 (2006), is published in KONA with the permission of the editorial committee of the Soc.

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Section: Assembly Processmentioning

confidence: 99%

Section: Assembly Processmentioning

confidence: 99%

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Self-assembly Patterning of Nano/Micro-Particles [Translated]<sup>†</sup>

Masuda

2007

KONA

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“…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].…”

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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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“…Having said this, keeping the www.elsevier.com/locate/photonics Photonics and Nanostructures -Fundamentals and Applications 2 (2004) [87][88][89][90][91][92][93][94][95] structural uniformity while scaling the PCs down to optical wavelengths is still a challenging problem, especially in three-dimensions (3D). Numerous fabrication techniques are investigated in the last decade, such as alternating layer deposition and etching process for 3D PCs [3], and electron lithography in combination with dry etching for 2D AlGaAs PCs [4]. The investigation of PCs was quickly spread over a wide range of photonics applications in the last decade, gearing towards micro-and nanoscale to be used in telecommunication and optical wavelengths [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Physics and applications of photonic crystals

Özbay

Bulu

Aydın

et al. 2004

Photonics and Nanostructures - Fundamentals and Applications

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In this article, we investigate how the photonic band gaps and the variety of band dispersions of photonic crystals can be utilized for various applications and how they further give rise to completely novel optical phenomena. The enhancement of spontaneous emission through coupled cavity waveguides in a one-dimensional silicon nitride photonic microcrystal is investigated. We then present the highly directive radiation from sources embedded in two-dimensional photonic crystals. The manifestation of novel and intriguing optical properties of photonic crystals are exemplified experimentally by the negative refraction and the focusing of electromagnetic waves through a photonic crystal slab with subwavelength resolution. #

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Cited by 19 publications

References 10 publications

Self-assembly Patterning of Nano/Micro-Particles [Translated]<sup>†</sup>

Self-assembly Patterning of Nano/Micro-Particles [Translated]<sup>†</sup>

Self-assembled colloidal structures for photonics

Physics and applications of photonic crystals

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