All-optical half adder based on cross structures in two-dimensional photonic crystals

作者：Liu, Qiang; Ouyang, Zhengbiao^*; Wu, Chih Jung; Liu, Chung Ping; Wang, Jong C

来源：Optics Express, 2008, 16(23): 18992-19000.

DOI：10.1364/OE.16.018992

We propose an all-optical half adder based on two different cross structures in two-dimensional photonic crystals. One cross structure contains nonlinear materials and functions as an "AND" logic gate. The other one only contains linear materials and acts as an "XOR" logic gate. The system is demonstrated numerically by the FDTD method to work as expected. The optimal operating speed without considering the response time of the nonlinear material, the least ON to OFF logic-level contrast ratio, and the minimum power for this half adder obtained were 0.91Tbps, 16dB and 436mW, respectively. The proposed structure has the potential to be used for constructing all-optical integrated digital computing circuits.

• 出版日期2008-11-10
• 单位深圳大学