Optical devices having flakes suspended in a host fluid to provide a flake/fluid system providing flakes with angularly dependent optical properties in response to an alternating current electric field due to the dielectric properties of the system

Kosc, Tanya Z; Marshall, Kenneth L; Jacobs, Stephen D

Optical devices having flakes suspended in a host fluid to provide a flake/fluid system providing flakes with angularly dependent optical properties in response to an alternating current electric field due to the dielectric properties of the system

Patent · Tue May 09 04:00:00 EDT 2006

OSTI ID:908441

Kosc, Tanya Z ^[1]; Marshall, Kenneth L ^[1]; Jacobs, Stephen D ^[2]

Rochester, NY
Pittsford, NY

Optical devices utilizing flakes (also called platelets) suspended in a host fluid have optical characteristics, such as reflective properties, which are angular dependent in response to an AC field. The reflectivity may be Bragg-like, and the characteristics are obtained through the use of flakes of liquid crystal material, such as polymer liquid crystal (PLC) materials including polymer cholesteric liquid crystal (PCLC) and polymer nematic liquid crystal (PNLC) material or birefringent polymers (BP). The host fluid may be propylene carbonate, poly(ethylene glycol) or other fluids or fluid mixtures having fluid conductivity to support conductivity in the flake/host system. AC field dependent rotation of 90.degree. can be obtained at rates and field intensities dependent upon the frequency and magnitude of the AC field. The devices are useful in providing displays, polarizers, filters, spatial light modulators and wherever switchable polarizing, reflecting, and transmission properties are desired.

Research Organization:: The University of Rochester (Rochester, NY)

Sponsoring Organization:: United States Department of Energy

DOE Contract Number:: FC03-92SF19460

Assignee:: The University of Rochester (Rochester, NY)

Patent Number(s):: 7,042,617

Application Number:: 10/405,163

OSTI ID:: 908441

Country of Publication:: United States

Language:: English

References (11)

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Optical devices having flakes suspended in a host fluid to provide a flake/fluid system providing flakes with angularly dependent optical properties in response to an alternating current electric field due to the dielectric properties of the system

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