Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1994-06-02
1995-12-05
Ben, Loha
Optical: systems and elements
Optical modulator
Light wave temporal modulation
365 2, 365122, 428209, G02F 109
Patent
active
054734665
ABSTRACT:
A thin transparent epitaxial layer of a magnetizable material (e.g. gallium ferrite) is deposited on a substrate of a dielectric transparent material (e.g. gadolinium gallium garnet). A mask made from an oxidizable material (e.g. silicon) deposited on the epitaxial layer covers pixels defining rows and columns and exposes the other areas on the epitaxial layer. The epitaxial layer is then annealed at a suitable temperature (e.g. 500.degree. C.) for a suitable time (e.g. 10 minutes) to oxidize the silicon and reduce the Fe atoms in the pixel areas beneath the mask to Fe.sup.++ ions. This causes the pixel areas beneath the mask to be more easily magnetizable than the other areas in the epitaxial layer. The mask is then removed and a first insulating layer is deposited on the epitaxial layer. A first plurality of windings is then deposited on the first insulated layer in insulating relationship to one another. Each winding extends in a sinuous path in three (3) directions, two (2) oppositely disposed, magnetically coupled to each pixel in an individual one of the columns. A second insulating layer is then deposited on the first windings. A second plurality of windings is then deposited on the second insulating layer in the same relationship to the pixels in the rows as the relationship of the first windings to the pixels in the columns. A pixel common to an individual winding in the first plurality and to an individual winding in the second plurality is then magnetized in accordance with the current magnitudes in the two (2) windings.
REFERENCES:
patent: 3831156 (1974-08-01), Myer
patent: 4164028 (1979-08-01), Voegeli
patent: 4497545 (1985-02-01), Ross
patent: 4500176 (1985-02-01), MacNeal
patent: 4500177 (1985-02-01), MacNeal
patent: 4584237 (1986-04-01), Pulliam
patent: 5389428 (1995-02-01), Fleming et al.
Tanielian Aram A.
Tanielian Garo W.
Ben Loha
Roston Ellsworth R.
Schwartz Charles H.
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