Thirty-five to forty percent incident power will be absorbed by the multilayers of EUV optics which causes thermal
deformation of mirrors, consequently affecting the optical performance of projection optics (PO). On the other hand the
gravity and mounting of mirrors introduce the structural deformation of mirrors. So the thermal and structural
deformations of mirrors are critical issues for extreme ultraviolet lithography (EUVL) at the technology node of 22 nm
and below. In this paper, we employ several software packages to study and control the deformation of the PO which is
employed in EUVL production tool with wafer throughput of one hundred 300 mm wafers per hour for the 22 nm
technology. The results show that the deformation of PO is reduced effectively and the imaging performance of the PO is
improved.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.