Optical modulation device and method using modulation layer of h

Details Optical modulation device and method using modulation layer of h Optical modulation device and method using modulation layer of h

1989-05-05

1993-12-21

Wojciechowicz, Edward

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359100, 359104, 365108, G02F 113

Patent

active

052725529

ABSTRACT:
An optical modulation device is provided by forming an optical modulation layer comprising a polymer liquid crystal having a helical structure and a non-helical structure in chiral smectic C phase. The helical structure of the polymer liquid crystal is selectively formed or removed to provide a recorded state. The recorded state is held below the glass transition point of the polymer liquid crystal. The helical pitch of the helical structure can be selectively changed to form a recorded state. The helical structure can be formed to dispose its principal axis perpendicularly to the polymer liquid crystal layer. The recorded state may be read out by detecting a reflectance from the polymer liquid crystal layer.

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