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21 March 2007 Extreme ultraviolet interference lithography with incoherent light
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In order to address the crucial problem of high-resolution low line-edge roughness resist for extreme ultraviolet (EUV) lithography, researchers require significant levels of access to high-resolution EUV exposure tools. The prohibitively high cost of such tools, even microfield tools, has greatly limited this availability and arguably hindered progress in the area of EUV resists. To address this problem, we propose the development of a new interference lithography tool capable of working with standalone incoherent EUV sources. Although EUV interference lithography tools are currently in operation, presently used designs require illumination with a high degree of spatial and/or temporal coherence. This, in practice, limits current systems to being implemented at synchrotron facilities greatly restricting the accessibility of such systems. Here we describe an EUV interference lithography system design capable of overcoming the coherence limitations, allowing standalone high-power broad sources to be used without the need for excessive spatial or temporal filtering. Such a system provides promising pathway for the commercialization of EUV interference lithography tools.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Patrick P. Naulleau, Christopher N. Anderson, and Stephen F Horne "Extreme ultraviolet interference lithography with incoherent light", Proc. SPIE 6517, Emerging Lithographic Technologies XI, 65172T (21 March 2007);

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