B. Griesebock

Bio: B. Griesebock is an academic researcher from University of Mainz. The author has contributed to research in topics: Photonic crystal & Lattice constant. The author has an hindex of 3, co-authored 6 publications receiving 236 citations.

Heterostructures of Polymer Photonic Crystal Films

Abstract: This paper describes ways to multilayer opaline films (opaline heterostructures) composed from functional opal layers of spheres with different lattice constants. At first various monodisperse coll...

Large Photonic Films by Crystallization on Fluid Substrates

Abstract: Cracks, which appear due to shrinkage during drying of artificial opaline films, strongly limit the use of these materials. Crystallization on fluid substrates (liquid metals) is a way to circumvent this problem. By this method it is possible to prepare crack-free three-dimensional “monocrystals” with a very low defect density and the size in millimeters.

Self-assembly of three-dimensional photonic crystals on structured silicon wafers

Abstract: The growth of an opal-like polymer photonic crystal (PhC) on deeply etched silicon wafers is reported It is shown that 10 μm deep trenches, as narrow as 10 μm can be uniformly filled by self-assembly of microspheres, in a close-packed face-centered-cubic lattice These observations are confirmed by optical reflectance measurements in the visible range, in agreement with theoretical calculations of the photonic band gap A slight fluctuation of the lattice parameter is noticed in the case of the narrowest channels The possibility to detach the PhC from the substrate is also demonstrated The potential of this approach for building complex PhC-based complex architectures is discussed

Photonic crystals based on two-layer opaline heterostructures

Abstract: Optical properties of several heterostructures representing two-layer opaline photonic crystals have been examined. Two separate stop-bands have been observed both in transmission and emission spectra. The effect of the interface disorder on the optical spectra was not observed, probably, due to the insufficient degree of order of the opaline layers.

Advances in colloidal assembly: the design of structure and hierarchy in two and three dimensions.

Abstract: This Review highlights the large number of methods to exploit colloidal assembly of comparably simple particles with nano- to micrometer dimensions in order to access complex structural hierarchies from nanoscopic over microscopic to macroscopic dimensions

Self-assembled photonic structures.

Abstract: Photonic crystals have proven their potential and are nowadays a familiar concept. They have been approached from many scientific and technological flanks. Among the many techniques devised to implement this technology self-assembly has always been one of great popularity surely due to its ease of access and the richness of results offered. Self-assembly is also probably the approach entailing more materials aspects owing to the fact that they lend themselves to be fabricated by a great many, very different methods on a vast variety of materials and to multiple purposes. To these well-known material systems a new sibling has been born (photonic glass) expanding the paradigm of optical materials inspired by solid state physics crystal concept. It is expected that they may become an important player in the near future not only because they complement the properties of photonic crystals but because they entice the researchers' curiosity. In this review a panorama is presented of the state of the art in this field with the view to serve a broad community concerned with materials aspects of photonic structures and more so those interested in self-assembly.

Opals: Status and Prospects

Abstract: The beauty of opals results from a densely packed, highly ordered arrangement of silica spheres with a diameter of several hundred nanometers. Such ordered nanostructures are typical examples of materials called photonic crystals, which can be formed by known microstructuring methods and by self-assembly. Opals represent a self-assembly approach to these structured media; such an approach can lead to novel materials for photonics, photocatalysis, and other areas. Although self-assembly leads to many types of defects, resulting in the surprising and very individual appearance of natural opals, it causes also difficulties in technological applications of opal systems.

Colloidal Photonic Crystals toward Structural Color Palettes for Security Materials

Abstract: Self-assembly of monodisperse colloidal particles into regular lattices has provided relatively simple and economical methods to prepare photonic crystals. The photonic stop band of colloidal crystals appears as opalescent structural colors, which are potentially useful for display devices, colorimetric sensors, and optical filters. However, colloidal crystals have low durability, and an undesired scattering of light makes the structures white and translucent. Moreover, micropatterning of colloidal crystals usually requires complex molding procedures, thereby limiting their practical applications. To overcome such shortcomings, we develop a pragmatic and amenable method to prepare colloidal photonic crystals with high optical transparency and physical rigidity using photocurable colloidal suspensions. The colloidal particles dispersed in a photocurable medium crystallized during capillary force-induced infiltration into a slab, and subsequent photopolymerization of the medium permanently solidifies the st...

Self-assembly of patchy particles into diamond structures through molecular mimicry.

Abstract: Fabrication of diamond structures by self-assembly is a fundamental challenge in making three-dimensional photonic crystals. We simulate a system of model hard particles with attractive patches and show that they can self-assemble into a diamond structure from an initially disordered state. We quantify the extent to which the formation of the diamond structure can be facilitated by “seeding” the system with small diamond crystallites or by introducing a rotation interaction to mimic a carbon−carbon antibonding interaction. Our results suggest patchy particles may serve as colloidal “atoms” and “molecules” for the bottom-up self-assembly of three-dimensional crystals.