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. 2022 May 3;12:7121. doi: 10.1038/s41598-022-11331-4

Figure 5.

Figure 5

A half-adder that is composed of cascaded diffractive NAND gates. (a) Digital implementation of a half-adder using NAND gates. (b) An all-optical half-adder composed of cascaded diffractive NAND gates. (c) The correctness of the intermediate all-optical calculation steps (xi1) and the sum (S) and carry (C) of the half-adder using different input combinations. (d) The intensity profiles at the output plane of the diffractive NAND IV (representing the sum) and the diffractive NAND V (representing the carry) gates. The inserted numbers in white font color indicate the relative optical signal within each aperture. Each input optical logical value is assumed to have a relative optical signal level of 1024 (a.u.), defining the ideal signal level per aperture.

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