Abstract
In this paper, an optical half adder is designed using photonic crystals. One of the features of this half adder is its small size. In the design of this structure, it has been tried to have a small size, shorter delay and high contrast ratio so that it can be used in the design of optical integrated circuits. For the sum and carry outputs, the obtained contrast ratio in the designed half adder is 15.4 dB and 7.4 dB, respectively. In addition, the proposed structure has a size of 70 µm2. The small size of this structure and the use of simple point defects, have caused the maximum delay time of this structure to be reduced to 0.07 ps. Due to these characteristics, this structure is suitable for high-speed optical integrated circuits.
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