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Definition of "shadowcasting logic gate" |
an optical logic gate originally using shadow casting technique. The principle of shadow casting logic gate can be explained as follows. First, NOT A and NOT B are generated from inputs A and B. Second, four products of AB, A (NOT B), (NOT A) B, and (NOT A) (NOT B) are produced by passing a light beam through two transparencies that could be spatial light modulators representing A and B,A and NOT B, NOT A and B, and NOT A and NOT B. Third, the four products are added optically. The sixteen combination of four products are the sixteen Boolean logic operations. |
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