Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-02-07
1996-06-18
Bovernick, Rodney B.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 95, 359 79, 359 3, 359 7, G02F 1133, G02F 11343
Patent
active
055284027
ABSTRACT:
An electrically addressable wavefront-modulation device has a thin film of transparent conductive material finely patterned as a hologram in which individual fringe elements need not have electrical continuity with each other or with external electrodes. The holographic pattern is covered with a transparent dielectric whose refractive index preferably matches that of the patterned material. An electro-optic layer varies in refractive index depending on application of a voltage to transparent conductive electrodes, one on each side of the device area to be addressed. The hologram's diffraction efficiency may be varied at high frequency. Thus the electrohologram is addressed by area or field rather than by element or matrix addressing. The electro-optic layer may be liquid crystal material. Preferred embodiments have T-shaped structures formed by subetching under each fringe element. Other preferred embodiments have displacement spacers between conductive fringe elements, displacing electro-optic material from inter-fringe spaces. The addressable electroholograms are fabricated by a process compatible with semiconductor wafer fabrication. A number of such electroholograms may be combined in stacked or coplanar combinations to perform various wavefront modulation functions.
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Bovernick Rodney B.
Parker Kenneth
Touw Theodore R.
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