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AssigneeL'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications)
InventorsJean Flicstein, Denise Morin
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Method for obtaining an organic polycrystalline material having in particular electro-optical properties, said material obtained and an electro-optical modulator comprising said material. This method includes a stage (1) for preparing a powder having a size grading of 500 to 800 nm of an organic compound having a delocalized system of electrons .pi. and presenting a non-centrosymmetrical crystalline structure, as well as intramolecular load transfer groupings, a stage (2) for drying the powder under vacuum, a stage (3) for pre-pressing the powder under vacuum, and a hot stage (5) for the uniaxial compression of the dried powder under vacuum. This method enables polycrystalline materials to be obtained, said materials comprising elongated monocrystalline grains orientated according to a given direction.
Polycrystalline material, wherein the monocrystalline grains are orientated along a given direction, said material being formed of a molecular organic compound selected from the group consisting of urea, hexamethylene-tetramine, 4-nitropyridine-1-oxide, 3-methyl-4-nitropyridine-1-oxide, and 3,5-dimethyl-4-nitropyridine-1-oxide whose molecules have at least one axis of symmetry along said direction and at least one dipole oriented along said axis.
Dependencies are inferred from the claim text.