All-optical half adder based on cross structures in two-dimensional photonic crystals.
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 0.91 Tbps, 16 dB and 436 mW, respectively. The proposed structure has the potential to be used for constructing all-optical integrated digital computing circuits.
Liu
Qiang
Q
THz Technical Research Center of Shenzhen University, Shenzhen 518060, China.
Ouyang
Zhengbiao
Z
Wu
Chih Jung
CJ
Liu
Chung Ping
CP
Wang
Jong C
JC
D004867:Equipment Design; D019544:Equipment Failure Analysis; D055096:Optical Devices; D017785:Photons; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*