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    • 8. 发明授权
    • Multiple-element lens systems and methods for uncorrelated evaluation of parameters in parameterized mathematical model equations for lens retardance, in ellipometry and polarimetry
    • 用于透镜延迟,椭圆测量和偏振测量的参数化数学模型方程中参数的不相关评估的多元素透镜系统和方法
    • US06804004B1
    • 2004-10-12
    • US09583229
    • 2000-05-30
    • Blaine D. JohsCraig M. HerzingerPing HeMartin M. Liphardt
    • Blaine D. JohsCraig M. HerzingerPing HeMartin M. Liphardt
    • G01B1106
    • G01N21/211G01J3/14G01J3/447
    • Disclosed are multi-element lenses which demonstrate reduced achromatic focal length and reduced electromagentic beam spot size dispersal effects in ellipsometer and polarimeter systems. Also disclosed is methodology for evaluating parameters in parameterized equations which enables calculating retardance entered to, or between, orthogonal components in a beam of electromagnetic radiation which is caused to pass through input and/or output optical elements and interact with a material system, by each of the input and output optical elements, substantially uncorrelated with retardation entered by the material system. Present invention input and/or output focusing lens(es) find application in spectroscopic ellipsometer mediated investigation of small spots on material systems, wherein a beam of electromagnetic radiation is caused to converge via an input lens, interact with a very small, chromatically undispersed spot area on a material system, then optionally re-collimate via an output lens, prior to entering a detector system. Present invention methodology provides benefit where it is necessary to separate out birefringent effects of input and/or output optical element focusing lens(es), optionally in combination with beam directing and/or window elements present in an ellipsometer system which are positioned with respect to input and/or output len(es) so as to be ellipsometrically indistinguishable therefrom, to arrive at material system characterizing ellipsometric PSI and DELTA results.
    • 公开了多元素透镜,其在椭偏仪和偏光计系统中表现出减少的消色差焦距和降低的电磁光束光斑尺寸分散效应。 还公开了用于评估参数化方程式中的参数的方法,该方法能够计算在电磁辐射束中输入到或之间的正交分量的延迟,所述正交分量被引导通过输入和/或输出光学元件并与材料系统相互作用 的输入和输出光学元件,与材料系统进入的延迟基本上不相关。 本发明的输入和/或输出聚焦透镜在光谱椭偏仪介导的对材料系统上的小斑点的调查中的应用发现,其中使电磁辐射束通过输入透镜会聚,与非常小的,色散的未分散的点相互作用 区域,然后在进入检测器系统之前可选地通过输出透镜重新校准。 本发明的方法在需要分离输入和/或输出光学元件聚焦透镜的双折射效应(可选地与存在于椭圆偏振仪系统中的光束引导和/或窗口元件)相关联的位置方面提供了益处,所述光学元件聚焦透镜相对于 输入和/或输出len(es)以便椭圆不能与其区分开来,以得到表征椭圆偏振PSI和DELTA结果的材料系统。