Method of detecting a particle and a lithographic apparatus
    130.
    发明授权
    Method of detecting a particle and a lithographic apparatus 失效
    检测颗粒和光刻设备的方法

    公开(公告)号:US08405825B2

    公开(公告)日:2013-03-26

    申请号:US12904610

    申请日:2010-10-14

    IPC分类号: G01N21/00

    摘要: A detector detects radiation from a mask to form an image, but the focal plane of the image is in front of the mask. Any particles arranged on the mask will be in focus. However, the pattern on the mask will be out of focus. It is therefore possible to detect the existence and location of particles on a mask having an arbitrary pattern. The depth of field of the detector is small and the focal plane is no further from the surface of the patterning device than two times the depth of field.

    摘要翻译: 检测器检测来自掩模的辐射以形成图像,但是图像的焦平面位于掩模的前面。 布置在面罩上的任何颗粒将被聚焦。 然而,面具上的图案将会失焦。 因此可以检测具有任意图案的掩模上的颗粒的存在和位置。 检测器的景深较小,焦平面不比图案形成装置的表面高两倍的景深。