Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Fokus Tec Gmbh

Other

Bayer Aktiengesellschaft

Agfa-gevaert Ag

Ibidi Gmbh

Focustec Gmbh

Hoffmann, Klaus

Faustig, Stephanie

Joachim Stumpe

Thomas Fischer

Michael Rutloh

Uwe Claussen

Klaus Hoffmann

Olga Kulikovska

Ralf Ruhmann

Dietrich Haarer

Thomas Bieringer

Claus D Eisenbach

Valentin Kahl

Sergei Ivanov

Valery Shibaev

Sergei Kostromin

Karl Fischer

Roland Wuttke

Christoph Jung

Leonid Goldenberg

Lutz L Asker

Lutz Laser

Yuriy Zakrevskyy

Charl Faul

The Kerr effect depends very strongly on the temperature and is associated with high operating voltages. The present invention relates to an electrically controllable optical element which comprises a cell (D) filled with a starting mixture (K) and having two substrates () and a conductive layer () applied onto the inner surface of the respective substrate (), wherein the starting mixture (K) comprises a mixture of dipolar, rod-shaped molecules () and semi-mesogenes () as active constituents, and wherein the starting mixture (K) forms a thin layer having a wide-meshed, anisotropic network () produced by photo-polymerization between the structured or/and flat conductive layers (), which are applied onto a substrate (), in a thin-film cell (D). According to the invention, an optically active surface profile (O) is incorporated on the inner surface of a substrate (or) or into the substrate (or) or both substrates (and).

Electrically controllable optical element, in particular thin-film cell having an optically active surface profile, and method for the production thereof

In order to configure or produce an electrically controllable optical element on the basis of the electro-optic Kerr effect with a low threshold and operating voltage, a minimized temperature dependence of the effect and a low response time, the Kerr liquid according to the invention comprises a mixture of rod-shaped molecules and non-rod-shaped molecules as active composites, a thin layer having a pre-stamping, wide-mesh, anisotropic network between structured and/or planar conductive layer applied to a substrate thus configure a thin-film cell in such a way that without electric field the state of the active composite of the Kerr liquid in the working temperature region RT is isotropic and that by electrically continuous adjustment, of the voltage U or by a switching-on or switching-off a change the voltage U, in the optical element a voltage-induced phase shift or a refractive index deviation is generated and the light passes through an electrode gap perpendicular to the electrodes.

Electrically controllable optical element made of an optically isotropic liquid, in particular lens, and method for the production thereof on the basis of liquid composites

The invention relates to polymer substrates which are provided with fluorescence features and in which photochemical fluorescence features, i.e. fluorescent structures, are produced by UV irradiation. Thus, fluorophores can be produced in polymer substrates with a low inherent fluorescence by means of suitable UV radiation, which fluorophores display a marked and detectable emission upon being excited with light of a suitable wavelength. If such an irradiation is implemented in a structured manner, emission patterns can be produced in this way in polymer substrates, which emission patterns can be applied for example as recovery grids in fluorescence microscopy. A further application field relates to product authentication which is made possible by the polymer substrates according to the invention provided with fluorescence features.

Polymer substrate with fluorescent structure, method for the production thereof and the use thereof

The present invention is directed to a film forming, photoactive, homogeneously mixed material comprising a complex prepared from (a) at least one ionic photosensitive compound which may undergo a photoreaction, selected from photoisomerizations, photocycloadditions and photoinduced rearrangements, and/or (a') at least one photosensitive polyelectrolyte ('second polyelectrolyte') carrying residues which may undergo said photoreaction, and (b) at least one ('first') polyelectrolyte carrying charges which are opposite to those of the active groups of the photosensitive material. This material has unique photochemical properties in that non-scattering, optically clear films may prepared therefrom which allow light-induced generation of optical anisotropy and of topological surface structures, e.g. such as surface relief gratings (SRG).

Film forming material and preparation of surface relief and optically anisotropic structures by irradiating a film of the said material

The present invention relates to a method and a device for three-dimensionally determining the refractive index and, if necessary, the layer thickness of transparent or partially transparent layers in which the layer () is irradiated at different angles of incidence () with polarised light, and variations in the polarisation of the light are measured and evaluated as the light passes through the layer (). The method is characterized in that the measurement is carried out through an immersion medium () between which the layer () is inserted. A highly accurate determination of the refractive index of anisotropic thin layers in all three spatial directions is made possible by this method.

Method and device for three-dimensionally determining the refractive index of transparent or partially transparent layers

Process for intensifying information in photo-addressable side-chain

Flat materials made from a polymer with a backbone and side groups branching off the backbone (side group polymer), which polymer has the following structural features (1) to (3):

Photo-induced optically anisotropic amorphous film materials from side

Growing community of inventors

Nauen, Germany

Joachim Stumpe