透射式位相光栅矢量衍射特性的实验研究  

EXPERIMENTAL OBSERVATIONS OF VECTOR DIFFRACTION CHARACTERISTICS OF TRANSMISSION PHASE GRATING

作　　者：高华[1] 周静[2] 樊振军[1] 郑志远[1] 

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083 [2]北京师范大学物理学系,北京100875

出　　处：《北京师范大学学报（自然科学版）》2011年第5期465-469,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(10905049);中央高校科研业务费专项基金资助项目(2011YYL004)

摘　　要：实验研究了透射式全息位相光栅的矢量衍射特性,实验结果表明当光栅常数接近或小于入射波长时,等光强的P、S偏振光入射,其各级衍射光强明显不同.经分析得知这种偏振依赖是由两方面的因素引起:玻璃基底的影响和光栅本身的矢量衍射特性所致.用时域有限差分方法(FDTD)模拟了光与位相光栅的相互作用,结果表明光栅本身的偏振依赖是由矢量衍射中P、S偏振光在光栅中形成的相对位相延迟不同引起的.Vector diffraction characteristics of transmission phase grating were investigated.Experimental data showed that diffraction intensities of P-polarization wave and S-polarization wave were different when period of grating was comparable to or smaller than wavelength of the incident beam.It was found that polarization dependence was caused by both effect of glass substrates and vector diffraction characteristics.Diffraction of phase gratings was simulated numerically by Finite Difference Time Domain（FDTD） method.It was found that polarization characteristics of phase gratings were accounted for by difference in relative phase retardation of P and S wave formed in the grating.

关 键 词：矢量衍射 位相光栅 偏振特性 时域有限差分方法 相对位相延迟 

分 类 号：O436.1[机械工程—光学工程]