| 摘要 |
<p>Lithographic Apparatus with Two-dimensional Alignment Measurement Arrangement and Two-dimensional Alignment Measurement Method A lithographic apparatus has an actuator to move an object with a mark (M3) with a plurality of structures (19) in rows and columns. An alignment arrangement has a light source, optics and a detector. The light source and the optics produce an alignment beam with a first spot portion (24x) extending in a first direction parallel to the columns and a second spot portion (24y) extending in a second direction parallel to the rows. The optics direct the alignment beam to the mark (M3), receive alignment radiation back from the mark (M3) and transmit the alignment radiation to the detector. The detector transmits an alignment signal to a processor that calculates a two-dimensional position of the mark (M3) based on the alignment signal.</p> |
