A complex diffraction device, which is excellent in designability, easy in setting the diffraction angle, adaptable to size increase, and easy to handle by adding a diffraction function resulting from an uneven pattern to the diffraction device comprising a liquid crystalline layer where the helical orientation of the smectic liquid crystal phase having a helical structure is maintained.

Complex diffraction device

Electronic devices will increasingly rely on new materials with improved properties such as lower coefficient of thermal expansion preferably close to silicon, higher modulus, lower permittivity & loss, lower moisture absorption, better thermal conductivity, good dimensional stability, and more importantly reduced warpage particularly after the build-up process. The thermal properties of LCP's have led to increasing interest for the packaging community. This work deals with the evaluation of LCP's for future electronic packaging applications. LCP samples obtained from industry were analyzed using TA instruments. The samples with the properties best matched to the needs of future electronic packaging applications will be chosen based on the thermal analysis data presented for (i) fabrication of a base substrate using solely reinforced LCP, (ii) evaluating LCP for use as a carrier film, (iii) performing laser ablation techniques for via formation in the build up layers, and (iv) plating of the vias and the films for through hole Z-direction connections and X, Y, signal lines. In the present work, application of LCP as a dielectric layer for the system-on-package process has been evaluated. It is expected that the reinforced LCP films can also be utilized as a substrate material thereby providing the unique opportunity for superior compatibility between the substrate and the dielectric layer.

Liquid crystal polymers (LCP) for high performance SOP applications

Waveplates formed of mesogen-containing polymers and planar lightwave circuits containing such waveplates. Polymers have sidechains containing mesogens such as biphenyl-containing groups. Polymers may have a glass transition temperature between 100 °C and 300 °C, and polymers may be stretched in excess of 150% to increase birefringence of polymer and provide thin films. Waveplates formed of stretched polymer films may have high biaxial birefringence.

Waveplate and optical circuit formed from mesogen-containing polymer

Provided are an organic semiconductor material, organic semiconductor thin film and organic thin-film transistor, which contain a perylene tetracarboxylic diimide derivative represented by the following formula (1): In the formula (1), R1 means a linear or branched alkyl group having from 1 to 20 carbon atoms, R2 means a linear or branched alkyl group having from 2 to 6 carbon atoms, R3 means a linear or branched alkyl group having from 2 to 6 carbon atoms, X1 and X2 each mean a heteroatom selected from an oxygen atom, sulfur atom or selenium atom, Y means a halogen atom or cyano group, m stands for a number of from 0 to 4, and n stands for a number of from 0 to 2. Further, the alkyl groups represented by R1 and R2 may each be substituted with one or more fluorine atoms.

Organic semiconductor material, organic semiconductor thin film, and organic thin film transistor

Waveplate, planar lightwave circuit incorporating the waveplate, and method of making an optical device. The waveplate is formed of a mesogen-containing polymer film having a backbone and sidechains containing mesogen groups. The waveplate may be formed by producing a mesogen-containing polymer film having a nonzero birefringence of suitable dimensions for insertion into a planar lightwave circuit. The waveplate may be so inserted into an optical circuit of a planar lightwave circuit so that an optical signal traversing the waveplate is changed, for instance, to have two polarization states.

Waveplate and optical devices formed using mesogen-containing polymer

A liquid crystalline polymer film formed from a liquid crystalline polymer the orientation structure of which is smectic CA phase fixed. In this orientation structure the angle between C-director in the liquid crystalline polymer and the film plane is not zero. The liquid crystalline polymer film is useful in optical and dynamic applications.

Liquid crystalline polymer film

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Liquid crystalline polymer film