International Business Machines Corporation

Rolic Ag

Csem Centre Suisse D'electronique Et De Microtechnique Sa&#x2014;recherche Et D&#xe9;veloppement

David Pires

Urs T Duerig

Bernd W Gotsmann

Armin W Knoll

Hubert Seiberle

James L Hedrick

Robert Dennis Miller

Jane Elizabeth Frommer

Klaus Schmitt

Charles Gordon Wade

Guillaume Basset

Martin Stalder

Omar Sqalli

The invention relates to an optical security system comprising an optical element with a patterned anisotropic optical property, wherein information is encoded and encrypted in the pattern of the optical element. The system further comprises a patterned polarizer in which the pattern is such that the information stored in the optical element can be decrypted.

Encrypted optical security device

The invention provides a method for generation of an orientation pattern in a photo-alignable material using parallax optic. The invention further provides optical devices comprising a parallax optical element and an element with patterned optical anisotropic properties. Such devices have angular dependent, optically anisotropic properties, which are useful for various applications.

Optical devices with patterned anisotropy incorporating parallax optic

The present invention concerns a method for constructing a light coupling system wherein a grating is manufactured on the surface of a multimode waveguide and defines the entrance of the waveguide for an incident light beam, said grating comprising a repetition of patterns. The grating is defined by a set of parameters comprising: &#x2022;grating period (P), separating two adjacent patterns, &#x2022;grating depth (d) between the highest and the lowest point of the pattern, &#x2022;incident angle mean value (&#x3b8;) of the incident light with respect to the waveguide. The method comprises a step of optimization of the set of parameters to obtain an optimized second set of parameters, in order to obtain a transmission efficiency (Ce) of the incident light into said waveguide for the first or the second diffractive order exceeding 35% for unpolarized light, or exceeding 50% for polarized light, at a given wavelength of the incident light.

Method to optimize a light coupling waveguide

A local probe storage array is provided that includes a substrate, and a polymeric layer over the substrate, the polymeric layer comprising a crosslinking agent comprising at least three alkyne groups.

Method and device for high density data storage

A local probe storage array is provided that includes a substrate, and a polymeric layer over the substrate, the polymeric layer comprising a crosslinking agent that has been cured, the crosslinking agent comprising at least three alkyne groups.

The present invention is directed to a method for producing a data storage medium on a surface of a substrate for storing data in the form of topographic features. The method comprises a first step wherein a crosslinking agent containing at least three alkyne groups is deposited on the surface of the substrate. In a second step the deposited cross linking agent is cured so as to obtain the data storage medium in the form of a crosslinked polymeric layer on the surface of the substrate. The invention is further directed to a data storage medium obtained by this method and a data storage device comprising this data storage medium.

The invention concerns a method for patterning a surface of a material. A substrate having a polymer film thereon is provided. The polymer is a selectively reactive polymer (e.g. thermodynamically unstable): it is able to unzip upon suitable stimulation. A probe is used to create patterns on the film. During the patterning, the film is locally stimulated for unzipping polymer chains. Hence, a basic idea is to provide a stimulus to the polymeric material, which in turn spontaneously decomposes e.g. into volatile constituents. For example, the film is thermally stimulated in order to break a single bond in a polymer chain, which is sufficient to trigger the decomposition of the entire polymer chain.

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Allschwil, Switzerland

David Pires