Holographic diffraction grating, process for its preparation and opto-electronic devices incorporating it
First Claim
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1. Polymer/liquid crystal composite material with a holographic grating structure formed by an alternating ordered succession of polymer layers and layers of nematic liquid crystal, characterised in that the said nematic liquid crystal layers comprise a homogeneous nematic monophase region which is substantially free from droplets of liquid crystal.
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Abstract
Composite polymer/liquid crystal material having a holographic grating structure formed by an alternating ordered succession of polymer layers and nematic liquid crystal layers. The nematic liquid crystal layers comprise an ordered nematic monophase region which is substantially free from liquid crystal droplets.
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Citations
12 Claims
- 1. Polymer/liquid crystal composite material with a holographic grating structure formed by an alternating ordered succession of polymer layers and layers of nematic liquid crystal, characterised in that the said nematic liquid crystal layers comprise a homogeneous nematic monophase region which is substantially free from droplets of liquid crystal.
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9. Process for the preparation of a holographic grating formed by an alternating ordered succession of polymer layers and nematic. liquid crystal layers, characterised in that it comprises the operations of:
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exposing a mixture comprising photoinitiator, monomer and nematic liquid crystal to an external agent, selected from a temperature change and electromagnetic radiation capable of causing reversible loss of the crystalline order of the mesogenic component of the mixture, illuminating the composition with an interference pattern of radiation capable of causing polymerisation of the illuminated regions, allowing the mesogenic material in the composition to reestablish the crystalline order through a slow decrease in the influence of the external agent. - View Dependent Claims (10)
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Specification