scholarly journals Self-Assembly of Colloidal Particles into Amorphous Photonic Crystals

2021 ◽  
Author(s):  
Yang Hu ◽  
Yuqi Zhang ◽  
Dongpeng Yang ◽  
Dekun Ma ◽  
Shaoming Huang
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Short Range ◽  
Colloidal Particles ◽  
Structural Color ◽  
Color Displays ◽  
Potential Applications

Amorphous photonic crystals (APCs) with angle-independent structural color, only short-range ordered and isotropic structures are highly desired due to their potential applications in non-fadeless pigments, color displays, sensors and optical...

Preparation and Properties of Silica Inverse Opal via Self-Assembly

2014 ◽  
Vol 699 ◽  
pp. 318-324 ◽  
Author(s):  
Syara Kassim ◽  
S. Padmanabhan ◽  
J. McGrath ◽  
M.E. Pemble
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Colloidal Synthesis ◽  
3 Dimensional ◽  
Inverse Opals ◽  
Simple Processing ◽  
Potential Applications

The bottom-up colloidal synthesis of photonic band gap (PBG) materials or photonic crystals (PC) has attracted considerable interest as compared to so-called top-down lithographic approaches due to the simple processing steps involved and the prospect of the economically viable production of complex 3-dimensional optical materials from simple colloidal particles. To date self-assembly techniques constitute the most popular approach to fabricate 3D photonic crystals from colloidal particle suspensions. Based on the natural tendency of monodisperse colloidal particles to organise into ordered arrays, this method represent the best option due to the ease of fabrication, ability to produce larger area samples and cost. Here we report on the fabrication of long range three-dimensional (3D) ordered poly (methyl methacrylate) (PMMA)-silica PC structures and the subsequent fabrication of robust silica inverse opals using self-assembly methods. The optical properties of these materials are described and discussed in terms of potential applications of these materials.

scholarly journals Self‐Assembly of Colloidal Particles for Fabrication of Structural Color Materials toward Advanced Intelligent Systems

2019 ◽  
Vol 2 (1) ◽  
pp. 1900085
Author(s):  
Heng Zhang ◽  
Xiuming Bu ◽  
SenPo Yip ◽  
Xiaoguang Liang ◽  
Johnny C. Ho
Keyword(s):  
Self Assembly ◽  
Intelligent Systems ◽  
Colloidal Particles ◽  
Structural Color

Framboid Self-Assembly and Self-Organization

2021 ◽  
pp. 262-282
Author(s):  
David Rickard
Keyword(s):  
Self Assembly ◽  
Energy Minimization ◽  
Short Range ◽  
Colloidal Particles ◽  
Repulsive Force ◽  
The Self ◽  
Icosahedral Symmetry ◽  
Entropy Maximization ◽  
Close Packed Structure ◽  
Packed Structure

The formation of framboids involves two distinct processes. First, pyrite microcrystals aggregate into spherical groups through surface free energy minimization. The self-assembly of framboid microcrystals to form framboids is consistent with estimations based on the classical Derjaguin-Landau-Verwey-Overbeek (DVLO) theory, which balances the attraction between particles due to the van der Waals forces against the interparticle electrostatic repulsive force. Second, the microcrystals rearrange themselves into ordered domains through entropy maximization. Icosahedral symmetry tends to minimize short-range attractive interactions and maximize entropy. The physical processes which facilitate this rearrangement are Brownian motion and surface interactions. Curved framboid interface enforce deviation from the cubic close packed structure. In the absence of a curved surface, weakly interacting colloidal particles preferentially self-assemble into a cubic close packed structure, and this is observed in irregular, non-framboidal aggregates of pyrite micro- and nanocrystals.

scholarly journals Blue Phase Liquid Crystals with Tailored Crystal Orientation for Photonic Applications

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1584
Author(s):  
SeongYong Cho ◽  
Masanori Ozaki
Keyword(s):  
Liquid Crystals ◽  
Photonic Crystals ◽  
Self Assembly ◽  
Crystal Orientation ◽  
Three Dimensional ◽  
Optical Characteristics ◽  
Crystal Plane ◽  
Potential Applications ◽  
Blue Phase ◽  
Control Light

Blue phase (BP) liquid crystals, which self-assemble into soft three-dimensional (3D) photonic crystals, have attracted enormous research interest due to their ability to control light and potential photonic applications. BPs have long been known as optically isotropic materials, but recent works have revealed that achieving on-demand 3D orientation of BP crystals is necessary to obtain improved electro-optical performance and tailored optical characteristics. Various approaches have been proposed to precisely manipulate the crystal orientation of BPs on a substrate, through the assistance of external stimuli and directing self-assembly processes. Here, we discuss the various orientation-controlling technologies of BP crystals, with their mechanisms, advantages, drawbacks, and promising applications. This review first focuses on technologies to achieve the uniform crystal plane orientation of BPs on a substrate. Further, we review a strategy to control the azimuthal orientation of BPs along predesigned directions with a uniform crystal plane, allowing the 3D orientation to be uniquely defined on a substrate. The potential applications such as volume holograms are also discussed with their operation principle. This review provides significant advances in 3D photonic crystals and gives a huge potential for intelligent photonic devices with tailored optical characteristics.

Invisible photonic prints shown by UV illumination: combining photoluminescent and noniridescent structural colors

2019 ◽  
Vol 7 (38) ◽  
pp. 11776-11782 ◽  
Author(s):  
Dongpeng Yang ◽  
Guolong Liao ◽  
Shaoming Huang
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Uv Light ◽  
The Self ◽  
Light Irradiation ◽  
Structural Colors ◽  
Uv Illumination ◽  
Uv Light Irradiation

Invisible photonic prints that become visible by UV light irradiation were prepared via the self-assembly of Y2O3:Eu colloidal particles into amorphous photonic crystals (APCs) with controlled fluorescent and noniridescent structural colors.

Fabrication of Photonic Crystals in Microchannels

2004 ◽  
Vol 817 ◽  
Author(s):  
Chun-Wen Kuo ◽  
Hui-Mei Hsieh ◽  
Jung-Chuan Ting ◽  
Yi-Hong Cho ◽  
Kung Hwa Wei ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Expansion Method ◽  
Large Area ◽  
Optical Components ◽  
Colloidal Photonic Crystals ◽  
Fabrication Procedure ◽  
Evaporation Induced Self Assembly ◽  
Easy Integration

AbstractWe have developed a fabrication procedure for growing photonic crystals in the lithographic defined microchannels, which enables easy integration with other planar optical components. This technique is based on the directed evaporation induced self-assembly of nanoparticles in the microchannels. Substrates with pre-patterned microchannels (30-100 μm wide) were dipped into solution of nanoparticles for several days. By controlling the evaporation rate, the meniscus contacting the microchannels will undergo evaporation-induced self-assembly. The capillary forces cause nanospheres to crystallize within the microchannels forming colloidal photonic crystals in the microchannels. Two types of colloidal particles, polystyrene and silica, have been employed to fabricate colloidal photonic crystals in the microchannels. Both types of colloidal particles were found to form large-area well-ordered colloidal single crystals in the microchannels. The optical reflection spectra from the (111) surfaces of the colloidal crystals formed by various sizes of nanoparticles have been measured. And the measured reflection peaks agree with the photonic bandgap calculated by the plane wave expansion method.

From colloidal particles to photonic crystals: advances in self-assembly and their emerging applications

2021 ◽  
Author(s):  
Zhongyu Cai ◽  
Zhiwei Li ◽  
Serge Ravaine ◽  
Mingxin He ◽  
Yanlin Song ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Colloidal Particles ◽  
State Of The Art ◽  
The State ◽  
Colloidal Photonic Crystals

This paper reviews the advances in the state-of-the-art colloidal self-assembly methods to fabricate colloidal photonic crystals and their emerging applications.

Fabrication and Defect Designs on DNA Linked 2-D Colloidal Photonic Crystals Using a Nd:YAG Pulsed Laser

2005 ◽  
Vol 901 ◽  
Author(s):  
Ramazan Asmatulu ◽  
Sejong Kim ◽  
Robin Bright ◽  
Phillip Yu ◽  
Fotios Papadimitrakopoulos ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Second Harmonic ◽  
Pulsed Laser ◽  
Single Strand ◽  
Glass Substrates ◽  
Hexagonal Close Packed ◽  
Colloidal Photonic Crystals ◽  
Self Assembled

AbstractControlled defects were created on DNA linked 2-D colloidal photonic crystals using a Nd:YAG pulsed laser. The 2-D photonic crystals were self-assembled using 1.8 μm polystyrene (PS) microspheres on functionalized glass substrates. To synthesize the hexagonal close packed crystalline samples, both substrate and particles attached single-strand DNA, sequence A on the substrate and sequence B on the particles. The DNA was hybridized using the DNA linker with complementary single-strand A’B’ that anchored the particles to the substrate during self-assembly. The 532 nm second harmonic wavelength beam of the pulsed Nd:YAG laser (1064 nm) with a pulse width of 10 ns was used for the removal of individual colloidal particles from the self assembled photonic crystals. In the present tests, the diameter of the laser beam was optically reduced from 7 mm to about 1.8 μm. Controlled line defects and geometrical shapes (e.g., hexagonal and triangle) were created in the 2D arrays in an aqueous medium.

scholarly journals A Study of the Optical Properties and Fabrication of Coatings Made of Three-Dimensional Photonic Glass

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 781
Author(s):  
Chih-Ling Huang
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Silica Nanoparticles ◽  
Self Assembly ◽  
Three Dimensional ◽  
Silica Nanoparticle ◽  
Structural Color ◽  
Nanoparticle Suspension ◽  
Nanosilica Particles ◽  
Photonic Glass

Photonic crystals employ optical properties based on optical, physical, chemical, and material science. Nanosilica particles have a high specific surface area and are widely used in nanotechnology research and biomedical applications. In this study, nanosilica particles were fabricated by sol–gel methods, and the particle sizes of the silica nanoparticles were 280, 232, and 187 nm, based on dynamic light scattering. The silica nanoparticle suspension solution was heated to boiling for fast evaporation processing for self-assembly to fabricate three-dimensional photonic glass for structural color coatings. The sample had an adjustable structural color (red: 640 nm, green: 532 nm, and blue: 432 nm). The microstructures of various structure-colored samples were arranged, but there was a disordered solid arrangement of silica nanoparticles. These were not perfect opal-based photonic crystals. Compared to opal-based photonic crystals, the arrangement of silica nanoparticles was a glassy structure with a short-range order. Due to the accumulation of silica nanoparticle aggregates, samples displayed a stable colloidal film, independent of the viewing angle. In our study, the fast solvent evaporation in the self-assembly process led to the formation of a colloidal amorphous array, and it fitted the requirement for non-iridescence. Non-iridescent photonic glass with various colors was obtained. This type of color coating has wide potential applications, including reflective displays, colorimetric sensors, textiles, and buildings.

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