摘要
基于LiNbO3晶体的电光效应,提出一种利用外加梯度电场控制的新型1×2电光开关的设计理论。采用理论计算及有限元数值模拟的方法对晶体的电光偏转效果及其内部梯度电场的分布进行了分析,讨论了外加电场强度、晶体尺寸、电极条数等对光线偏转角度的影响。分析结果表明,外加梯度电场可以在LiNbO3晶体内部形成折射率的梯度变化,造成光线逐步偏转,且外加电场强度越大,电极条数越多,偏转角度越大。对尺寸为2 mm×2 mm×4 mm的LiNbO3晶体施加的外部电场最大值在1 kV/mm的量级时,光线总偏转角可达到2°(340 mrad)左右,有效地实现了1×2光开关的效果。
A novel design principle of gradient electric field-controlled optical switch which bases on the electro-optical effect of LiNbO3 crystal is proposed. The distribution of the gradient electric field and the effect of the electro-optical deflection is studied through both theoretical analysis and numerical simulation of finite element method（FEM）. The influence of the gradient electric field and dimensions of the crystal on the incident beam＇s deflection angle is discussed. The results show that the gradient electric field can cause the distribution of gradient refractive index in the LiNbO3 crystal and change the direction of the beam gradually, when the maximum applied electric field is on the level of 1 kV/mm, about 2°（340 mrad） deflection angle can be attained, which makes it effectively serve as a device of 1× 2 optical switch.
出处
《半导体光电》
EI
CAS
CSCD
北大核心
2008年第1期56-59,共4页
Semiconductor Optoelectronics
基金
国家自然科学基金项目(10477015)
教育部"新世纪优秀人才支持计划"项目(NCET-05-0843)
陕西省科技攻关计划项目(2004K05-G14)
西安市科技攻关计划项目(GG05042)
关键词
非线性光学
光开关
梯度电场
LINBO3晶体
有限元
nonlinear optics optical switch gradient electric field LiNbO3 crystal finite element method（FEM）
