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Proceedings Paper

Simulation of Sub-wavelength 3D Photomask Induced Polarization Effect by RCWA
Author(s): Liang Yang; Yanqiu Li; Lihui Liu; Jianfeng Wang
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Paper Abstract

In 45nm technology node and beyond with hyper NA and Off-axis Illumination (OAI) lithography, mask induced polarization effect is remarkable. At this scale, traditional Kirchhoff approximation, in which the masks are considered to be infinitely thin objects, is no longer valid. Rigorous three-dimensional (3D) mask model is required for precise evaluation of mask diffraction. In this paper, a general 3D mask model based on the rigorous coupled-wave analysis (RCWA) is presented, and the change of polarization state as a function of mask and incident light properties is evaluated. The masks considered are the binary chrome mask and 10% Si-Si3N4 attenuated phase shifting mask. The results show that the mask induced polarization effects depend on the mask and incident light properties, such as mask material, absorber thickness, mask pitch, feature size, the polarization and incident angle of the light.

Paper Details

Date Published: 15 October 2012
PDF: 10 pages
Proc. SPIE 8418, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems, 841815 (15 October 2012); doi: 10.1117/12.978258
Show Author Affiliations
Liang Yang, Beijing Institute of Technology (China)
Yanqiu Li, Beijing Institute of Technology (China)
Lihui Liu, Beijing Institute of Technology (China)
Jianfeng Wang, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 8418:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems
Tianchun Ye; Song Hu; Yanqiu Li; Xiangang Luo; Xiaoyi Bao, Editor(s)

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