All-optical logic gate based on nonlinear effects of two-dimensional photonic crystals
All-optical XOR,NOT and two-input AND logic gates are designed based on the nonlinear effect and linear interference effect of photonic crystals.The complex logic expressions are divided by inversion theorem,and all-optical NOR gate and four-input AND gate logic devices are designed by cascade combina-tion.In this paper,the Finite-Difference Time-Domain(FDTD)method is used for simulation,and the coup-ling characteristics of nonlinear annular cavities are analyzed.Then,the above logic devices are designed un-der the condition that the signal wavelength is 1.47 μm,and more input devices can be designed by expand-ing the input.The influence of signal power on the logic function of the four-input AND logic devices is ana-lyzed.The results show that when the power of the signal light source is between 1.1 W/μm2 and 3.4 W/μm2,the logical contrast ratio of the output is greater than 10 dB.The response time of the designed device is only 1.6 ps,the occupied area is small,and the device is easy to expand and integrate.It has great application pro-spect in optical processing systems and integrated optical paths.
ring resonatormicrocavityoptical logicsnonlinear effect
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