用于光导板的亚微米光栅衍射特性研究

Diffraction Characteristics of Sub-micron Gratings for Light Guide Plate

提出了利用亚微米光栅制作光导板的方法,用严格耦合波理论计算分析了亚微米光栅从光密介质到光疏介质的1级透射衍射效率与光栅槽深、入射角度的关系,讨论了在满足基底全反射条件的入射角时对应于R、G、B三原色光的亚微米光栅(0.651μm、0.508μm、0.405μm)在导波条件下的光场衍射特性,并用实验证明在导波条件下1级衍射效率与光栅槽深关系的可靠性。给出亚微米光栅型光导板的初始结构,并进行了误差分析。

A new light guide plate with sub-micron gratings is proposed. By using rigorous coupled-wave theory, the relationship between the first order transmission efficiency and the depths of grooves and the incidence angles is analyzed when lights transmit from submicron gratings＂ optically denser medium to optically thinner medium. The characteristic of transmission field using tricolor light with the incidence angle under the total internal reflec- tion condition is discussed. The relationship curve of the first order transmission efficiency versus depths of grooves is proved experimentally. Finally, the initial structure of light guide plate with sub-micron gratings is given and the error is analyzed.