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    • 71. 发明申请
    • Inspection Apparatus for Lithography
    • 光刻检验仪
    • US20110102793A1
    • 2011-05-05
    • US12922587
    • 2009-03-24
    • Alexander Straaijer
    • Alexander Straaijer
    • G01J4/00
    • G03F7/70608G01B11/0641G01J4/04G01N21/211G01N21/9501
    • Four separately polarized beams are simultaneously measured upon diffraction from a substrate (W) to determine properties of the substrate. Linearly, circularly or elliptically polarized radiation is transmitted through a first beam splitter (N-PBS) and split into two polarized beams. These two beams are further split into two further beams using two further beam splitters, the further beam splitters (32,34) being rotated by 45° with respect to each other. The plurality of polarizing beam splitters enables the measurement of the intensity of all four beams and thus the measurement of the phase modulation and amplitude of the combined beams to give the features of the substrate. Algorithms are used to compare the four intensities of each of the polarized angles to give rise to the phase difference between the polarization directions and the ratio between the two main polarization direction amplitudes of the original polarized beam.
    • 在从基底(W)衍射时同时测量四个分离的偏振光束,以确定基底的性质。 线性,圆形或椭圆偏振辐射通过第一分束器(N-PBS)传输并分裂成两个偏振光束。 使用两个另外的分束器将这两个光束进一步分成两个另外的光束,另外的光束分离器(32,34)相对于彼此旋转45°。 多个偏振分束器能够测量所有四个光束的强度,从而测量组合光束的相位调制和振幅,以给出衬底的特征。 算法用于比较每个偏振角的四个强度,以产生偏振方向之间的相位差和原始偏振光束的两个主偏振方向幅度之间的比率。
    • 74. 发明授权
    • Inspection apparatus for lithography
    • 光刻检验装置
    • US08681312B2
    • 2014-03-25
    • US12920968
    • 2009-03-20
    • Alexander Straaijer
    • Alexander Straaijer
    • G03B27/42
    • G03F7/70616G01N21/211G01N21/956
    • The measurement of two separately polarized beams (Ix, Iy) upon diffraction from a substrate (W) in order to determine properties of the substrate is disclosed. Circularly or elliptically polarized radiation is passed via a variable phase retarder in order to change the phase of one of two orthogonally polarized radiation beams with respect to the other of the two beams. The phase change is dependent on the wavelength of the polarized beam. The relative phases of the two radiation beams and other features of the beams as measured in a detector gives rise to properties of the substrate surface.
    • 公开了从衬底(W)衍射出的两个单独偏振光束(Ix,Iy)的测量,以便确定衬底的性质。 圆形或椭圆偏振辐射通过可变相位延迟器通过,以改变两个正交偏振辐射束中的一个相对于两个光束中的另一个的相位。 相位变化取决于偏振光束的波长。 在检测器中测量的两个辐射束的相对相位和光束的其它特征产生了衬底表面的性质。
    • 75. 发明申请
    • Inspection Method and Apparatus, and Associated Computer Readable Product
    • 检验方法与装置及相关计算机可读产品
    • US20120044495A1
    • 2012-02-23
    • US13033135
    • 2011-02-23
    • Alexander Straaijer
    • Alexander Straaijer
    • G01J4/00
    • G03F7/70625
    • A system is configured to measure two separately polarized beams upon diffraction from a substrate in order to determine properties of a grating on a substrate. Linearly polarized light sources are passed via a fixed phase retarder in order to change the phase of one of two orthogonally polarized radiation beams with respect to the other of the two beams. The relative phases of the two radiation beams and other features of the beams as measured in a detector gives rise to properties of the substrate surface. The grating and the initial linear polarization of the radiation beam are angled non-orthogonally relative to each other.
    • 系统被配置为在从基板衍射时测量两个分离的偏振光束,以便确定衬底上的光栅的性质。 线性偏振光源通过固定相位延迟器通过,以改变两个正交偏振辐射束中的一个相对于两个光束中的另一个的相位。 在检测器中测量的两个辐射束的相对相位和光束的其它特征产生了衬底表面的性质。 辐射束的光栅和初始线性极化相对于彼此非正交成角度。