We discuss the aberration-induced intensity imbalance of alternating phase-shifting mask (Alt-PSM) in lithographic imaging, in contrast to numerous studies on mask-induced intensity imbalance. Based on the Hopkins theory of partial coherent imaging, a linear relationship between the intensity difference of adjacent peaks in an Alt-PSM image and even aberration is established by formulations and verified by numerical results. The application of the linear relationship is briefly discussed.
© 2010 Optical Society of America
Original Manuscript: November 9, 2009
Revised Manuscript: March 17, 2010
Manuscript Accepted: March 22, 2010
Published: April 26, 2010
Bo Peng, Xiangzhao Wang, Zicheng Qiu, Qiongyan Yuan, and Yuting Cao, "Aberration-induced intensity imbalance of alternating phase-shifting mask in lithographic imaging," Opt. Lett. 35, 1404-1406 (2010)