公开(公告)号：SG178368A1

公开(公告)日：2012-04-27

申请号：SG2012009551

申请日：2010-08-05

Applicant: ASML NETHERLANDS BV

Inventor： SMILDE HENDRIK ,  DEN BOEF ARIE ,  COENE WILLEM ,  BLEEKER ARNO ,  KOOLEN ARMAND ,  PELLEMANS HENRICUS ,  PLUG REINDER

Abstract: A metrology apparatus is arranged to illuminate a plurality of targets with an off-axis illumination mode. Images of the targets are obtained using only one first order diffracted beam. Where the target is a composite grating, overlay measurements can be obtained from the intensities of the images of the different gratings. Overlay measurements can be corrected for errors caused by variations in the position of the gratings in an image field.

公开(公告)号：NL2005192A

公开(公告)日：2011-02-28

申请号：NL2005192

申请日：2010-08-05

Applicant: ASML NETHERLANDS BV

Inventor： SMILDE HENDRIK ,  BLEEKER ARNO ,  BOEF ARIE ,  KOOLEN ARMAND ,  PELLEMANS HENRICUS ,  PLUG REINDER ,  COENE WILLEM

IPC: G03F7/20 ,  G01N21/47

Abstract: A metrology apparatus is arranged to illuminate a plurality of targets with an off-axis illumination mode. Images of the targets are obtained using only one first order diffracted beam. Where the target is a composite grating, overlay measurements can be obtained from the intensities of the images of the different gratings. Overlay measurements can be corrected for errors caused by variations in the position of the gratings in an image field.