Patent ID: 11960212
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. An extreme ultraviolet (EUV) lithography device comprising:
an EUV light source;
a first optical system comprising a freeform illumination system and configured to receive EUV light from the EUV light source and incident the EUV light on an EUV mask;
a second optical system configured to receive the EUV light reflected from the EUV mask and incident the reflected EUV light on a wafer;
a mask stage on which the EUV mask is provided;
a wafer stage on which the wafer is provided; and
a controller configured to:
control the mask stage and the wafer stage, and
render the freeform illumination system by:
assigning priorities to respective positions of the facets of pupil facet mirror by assigning a value to each position of the facets of the pupil facet mirror, and
assigning, using linear programming, a field facet mirror to the pupil facet mirror based on the assigned values to each position of the facets of the pupil facet mirror.