LiNbO3基Sn-As2S8单偏振单模波导电光开关的设计

掺锡非晶态硫化砷(Sn-As_2S_8)半导体具有独到的光阻断效应,与电光效应晶体结合有望构成新的功能器件。为此提出了一种以铌酸锂(LiNbO_3)为基板、以Sn-As_2S_8半导体为导波的马赫一曾德干涉型电光开关的方案。阐述了器件设计的理论和方法,设计了LiNbO_3基Sn-As_2S_8单偏振单模波导,对3dB定向耦合器做了取点扫描法优化设计,对电压与电极长度之间的关系进行了定量计算。器件经三维BPM仿真表明,在外加电压on和off的情况下,输出端口可分别实现(0.14±0.06)%和(99.95±0.02)%的耦合效率,显示出良好的电光开关功能。

Design of LiNbO3-based Sn-As2S8 polarization-independence and single-mode waveguide electrical-optical switches

There is unique optical-stopping effect with Sn-As_2S_8 amorphous semiconductors,a new functional device could be designed using it combined with electro-optical crystal.A new kind of Mach-Zehnder interference electro-optical switch using LiNbO_3 as substrate,Sn-As_2S_8 as wave-guided is designed.On the basis of the device design theory and methods,LiNbO_3- based Sn-As_2S_8 polarization-independence and single-mode waveguide is designed,3dB directional coupler is optimized using check-point scanning method,the relationship between the voltage and the electrode length is studied using quantitative calculation.Device simulation with three-dimensional BPM shows that in the absence of voltage,the coupled efficiency is (99.95±0.02)%.In voltage,the coupled efficiency is(0.14±0.06)%.Electro-optical switching function is achieved well on this device.