摘要:
The alignment of liquid crystal materials in cells utilized for devices is significantly enhanced through the use of materials such as polyamides, polyimides, nylons, and polyesters. This expedient for alignment of liquid crystal materials is useful for nematic and cholesteric liquid crystals, but finds particularly advantageous use for aligning smectic liquid crystals.
摘要:
The use of a certain class of liquid crystal materials that exhibit a smectic C phase allows the production of a bistable liquid crystal display element. Such bistable display elements promote the use of matrix addressing for liquid crystal based elements in a display.
摘要:
Liquid crystal devices having excellent speed are produced by utilizing an appropriate liquid crystal mixture. This mixture is prepared by selecting liquid crystal materials having opposite pitch and having specifically chosen spontaneous polarizations.
摘要:
In one embodiment this invention provides polymerizable tetraazaporphyrin dyes, and corresponding polymers which can be formed into thin film optical waveguiding media which exhibit nonlinear optical susceptibility.
摘要:
This invention provides an optical medium which consists of a composite of homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component.In one embodiment this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline compound.
摘要:
The present invention is directed to electro-optico chromophore bridge compounds and donor-bridge compounds which can be used in the preparation of polymeric thin films for waveguide media.
摘要:
The present invention is directed to dicyanomethylenedihydrofuran-based electron acceptors which can be used in the preparation of polymeric thin films for waveguide media, and methods of making the same.
摘要:
An optical signal limiter is provided for limiting transmission of a continuous wave optical signal that exceeds a preselected threshold power level. The limiter includes a body having input and output ends that is formed at least in part from a material having a negative thermal index coefficient of between about −0.5×10−4 °C.−1 and −4.0×10−4 °C.−1 and an absorption coefficient of between 1.0 to 5.0 dB/cm at wavelengths between 980-1650 nm. The limiter also includes collimating fibers mounted on the input and output ends to minimize low power signal losses across the limiter body. It may be installed at a junction between two optical fibers and is preferably formed from a curable adhesive having the aforementioned negative thermal index coefficient to obviate the need for separate bonding materials and joining steps during the installation of the limiter. The optical limiter is reusable and with a recovery time of 1-5 milliseconds advantageously prevents power surges in optical circuits from damaging sensitive optical components by limiting the amplitude of such surges within 0.2-0.5 milliseconds.
摘要:
This invention provides novel vinyl polymers with pendant side chains which exhibit nonlinear optical response. The polymers have utility as a transparent optical media in optical devices.An invention vinyl polymer is illustrated by the acrylate copolymer of the following structure: ##STR1##
摘要:
This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component.In one embodiment this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline compound.