数值模拟微米粒子的体全息记录与再现

体全息对小粒子记录及再现的影响关系到体全息材料在粒子场检测领域的应用前景,提出结合角谱传播理论与多光栅耦合波理论进行体全息图衍射分析的方法,并数值模拟了微米量级小粒子衍射光场的体全息记录与再现。数值分析结果表明体全息理论并不能像薄全息理论那样精确的再现出原始物光。其再现光场的角谱分布相对于原始光场存在高阶衰减,这使得再现光场成像后的图像边缘模糊,而且模糊程度还会随着粒子尺寸的下降逐渐上升。虽然这一现象为粒子边缘判读带来困难,但是再现图像的径向强度分布可为提高判断精度提供有益的参考。

Simulation of Volume Holography Record and Reconstruction for Micron Particle

Influence from volume holography during small particle record and reconstruction closely relates to the implement of volume holography in the particle measurement domain. Angular spectrum theory combining with multi-grating coupled wave method for analyzing diffraction from hologram is proposed, and the volume hologram record and reconstruction about diffraction light field of micron particle are simulated in this paper. Simulation result, which is different from thin holograph- ic theory＇s, shows that reconstructed light field can＇t be perfectly same with original light field when volume holographic the- ory is used. Reconstructed field is weaker than the original field especially at high order angular spectrum. This phenomenon becomes severe when the dimension of particle becomes small, and it leads edge blurry. Also it is hard to judge the edge of imaging pattern because of this phenomenon, but the simulation result can be useful reference for enhancing accuracy.