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    • 2. 发明申请
    • METHOD OF INSPECTING A SUBSTRATE, METROLOGY APPARATUS, AND LITHOGRAPHIC SYSTEM
    • 检查基板,计量器具和光刻系统的方法
    • WO2018069052A1
    • 2018-04-19
    • PCT/EP2017/074618
    • 2017-09-28
    • ASML NETHERLANDS B.V.
    • TUKKER, Teunis, WillemSINGH, AmandevVAN DER ZOUW, Gerbrand
    • G03F7/20G01B9/02G01N21/95G01N21/956
    • G03F7/70633G01B9/02016G01B11/272G01N21/9501G01N21/956G01N21/95607G01N2021/95676G03F7/70625G03F7/70941
    • Metrology apparatus and methods are disclosed. In one arrangement, a substrate is inspected. A source beam of radiation (131) emitted by a radiation source (50) is split into a measurement beam (132) and a reference beam (133). A first target is illuminated with the measurement beam, the first target being on the substrate (W). A second target (90) is illuminated with the reference beam, the second target being separated from the substrate. First scattered radiation (134) is collected from the first target and delivered to a detector (80). Second scattered radiation (135) is collected from the second target and delivered to the detector. The first scattered radiation interferes with the second scattered radiation at the detector. The first target comprises a first pattern. The second target comprises a second pattern, or a pupil plane image of the second pattern. The first pattern is geometrically identical to the second pattern, the first pattern and the second pattern are periodic and a pitch of the first pattern is identical to a pitch of the second pattern, or both.
    • 公开了计量装置和方法。 在一种布置中,检查衬底。 由辐射源(50)发射的源辐射束(131)被分成测量束(132)和参考束(133)。 测量光束照射第一个目标,第一个目标位于衬底(W)上。 用参考光束照射第二目标(90),第二目标与衬底分离。 从第一目标收集第一散射辐射(134)并传送到检测器(80)。 从第二个目标收集第二散射辐射(135)并传送到检测器。 第一散射辐射在检测器处干扰第二散射辐射。 第一个目标包括第一个模式。 第二目标包括第二图案或第二图案的瞳面图像。 第一图案在几何上与第二图案相同,第一图案和第二图案是周期性的,并且第一图案的间距与第二图案的间距相同,或者两者都相同。