周期性极化铌酸锂晶体的电光复合逻辑门

Electro-optical Composite Logic Gates Based on Periodically Poled Lithium Niobate Crystal

根据准相位匹配线性电光效应耦合波理论,基于单个周期性极化铌酸锂晶体,提出了外电场可控的电光复合与门、或门的逻辑计算方法.采用级联周期性极化铌酸锂晶体,探讨了外电场可控的电光复合逻辑异或门、半加法器、半减法器的逻辑计算方法.在外加电场分别为0.184KV/mm和0.368KV/mm条件下,分析了光波的波长、方位角和极角、晶体的温度对逻辑输出的影响.研究结果表明,基本逻辑门的逻辑计算能够成功实现,但其逻辑计算对光波波长、晶体温度、方位角和极化角非常敏感,这些参量轻微的变化会导致逻辑输出的改变.该方案可推广到更为复杂的基本逻辑门以及三个以上逻辑输入与输出的基本逻辑门中.

According to the coupling-wave theory of quasi-phase-matched linear electro-optic effect, the logical calculation methods of the AND and OR gates with electro-optical composite were proposed based on a single periodically poled lithium niobate. And those of the exclusive-OR gate, half-adder and half- subtractor were further explored based on cascading periodically poled lithium niobate crystal. With the applied electric field fixed at 0. 184 KV/mm and 0. 368 KV/mm , the influences of the wavelength,the azimuth and the polar angle of light, as well as the temperature of the crystal on the logic output were discussed. It is found that the logical calculation of the above-mentioned basic logic gates can be performed successfully. However, the logical calculation is very sensitive to the temperature, the azimuth and the polar angle. The slight varization of these parameters will lead to the change of the logic output. The calculation scheme can be generalized to applications of more complex basic logic gate, and the various basic logic gates of more than three logic inputs and outputs.