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    • 7. 发明授权
    • Inspection apparatus and method
    • 检验仪器及方法
    • US09304077B2
    • 2016-04-05
    • US13166384
    • 2011-06-22
    • Lucas Henricus Johannes StevensArno Jan Bleeker
    • Lucas Henricus Johannes StevensArno Jan Bleeker
    • G01N21/00G01N21/17G01N21/956
    • G01N21/1717G01N21/00G01N21/95623
    • Ghost reflections in a catadioptric scatterometer objective are excluded from an angle-resolved spectrum measurement by using a partial pupil for illumination and for the measurement excluding the area of the pupil plane that has been illuminated. Ghost reflections are reflected back into same point in the pupil plane. The ghost reflections do not interfere with the signal in the non-illuminated area of the pupil plane. An illumination system provides a beam of electromagnetic radiation to illuminate a first area in an illumination pupil plane of the objective. The objective is arranged as to illuminate the substrate with the beam of electromagnetic radiation. The illumination pupil plane is the back projected image of the pupil plane of the objective and is also imaged into the measurement pupil plane at the back focal plane of the objective, via auxiliary optics. A detector is configured to measure an angle resolved spectrum arising from the illumination of the substrate, in a measurement area of the measurement pupil plane of the objective excluding an area corresponding to the first area.
    • 通过使用用于照明的部分光瞳和除了被照明的光瞳面的区域之外的测量,从角度分辨光谱测量中排除反射折射式散射仪物镜中的鬼反射。 幽灵反射回到瞳孔平面上的相同点。 幽灵反射不影响瞳孔平面的非照明区域中的信号。 照明系统提供电磁辐射束以照射物镜的照明光瞳平面中的第一区域。 该目的被布置为用电磁辐射束照射基板。 照明光瞳平面是物镜的光瞳平面的背投影像,并且还通过辅助光学器件在物镜的后焦平面处成像到测量光瞳平面中。 检测器被配置为测量除了与第一区域相对应的区域之外的物镜的测量光瞳平面的测量区域中由基板照射产生的角度分辨光谱。