OPTICAL ELEMENT, LITHOGRAPHIC APPARATUS INCORPORATING SUCH AN ELEMENT, METHOD OF MANUFACTURING AN OPTICAL ELEMENT
    3.
    发明申请
    OPTICAL ELEMENT, LITHOGRAPHIC APPARATUS INCORPORATING SUCH AN ELEMENT, METHOD OF MANUFACTURING AN OPTICAL ELEMENT 审中-公开
    光学元件,包含这种元件的光刻设备,制造光学元件的方法

    公开(公告)号:WO2013113537A3

    公开(公告)日:2013-09-26

    申请号:PCT/EP2013050395

    申请日:2013-01-10

    Inventor: SINGH HARMEET

    Abstract: A spectral purity filter is integrated with a collector optic (CO) in an EUV lithography apparatus. The element is coated on at least one surface (410) with a multilayer stack comprising a plurality of alternating material layers (for example Mo, Si) suitable for reflecting radiation of EUV wavelength. To manufacture the element, a substrate (402) is provided with a three-dimensional profile (410a, 412, 410b) on a scale much larger than the wavelength of EUV radiation. The multilayer stack is then applied as a series conformal coatings formed by atomic layer deposition on the substrate after formation of said profile. The profile, as reproduced in the MLM coating (310a, 312, 310b), forms a spectral purity filter. Unwanted radiation such as infrared radiation will be scattered or diffracted so that a reduced portion is reflected in the same direction as the reflected EUV radiation. The profile may be designed to form a phase grating, or a scattering texture.

    Abstract translation: 光谱纯度滤光片与EUV光刻设备中的收集器光学器件(CO)集成。 该元件用至少一个表面(410)涂覆有多层叠层,该叠层包括适于反射EUV波长的辐射的多个交替材料层(例如Mo,Si)。 为了制造元件,衬底(402)设置有比EUV辐射的波长远大得多的三维轮廓(410a,412,410b)。 然后在形成所述轮廓之后,将多层叠层施加为通过原子层沉积形成在衬底上的串联保形涂层。 如在MLM涂层(310a,312,310b)中再现的轮廓形成光谱纯度滤光片。 诸如红外辐射之类的不需要的辐射将被散射或衍射,使得减少的部分以与反射的EUV辐射相同的方向被反射。 该轮廓可以被设计成形成相位光栅或散射纹理。

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