Abstract
As the development of extreme-ultraviolet (EUV) lithography progresses, interest grows in the extension of traditional optical components to the EUV regime. The strong absorption of EUV by most materials and its extremely short wavelength, however, make it very difficult to implement many components that are commonplace in the longer wavelength regimes. One such component is the diffractive optical element used, for example, in illumination systems to efficiently generate modified pupil fills. The fabrication and characterization of an EUV binary phase-only computer-generated hologram is demonstrated, allowing arbitrary far-field diffraction patterns to be generated. Based on reflective architecture, the fabricated device is extremely efficient. Based on an identically fabricated null hologram, the absolute efficiency into one diffracted order of 22% has been demonstrated. In the case where axially symmetric diffraction patterns are desired (both positive and negative diffraction orders can be used), the efficiency can be twice as high.
© 2007 Optical Society of America
Full Article | PDF ArticleMore Like This
Patrick P. Naulleau, J. Alexander Liddle, Farhad Salmassi, Erik H. Anderson, and Eric M. Gullikson
Appl. Opt. 43(28) 5323-5329 (2004)
Thomas Kämpfe, Ernst-Bernhard Kley, Andreas Tünnermann, and Peter Dannberg
Appl. Opt. 46(22) 5482-5488 (2007)
Takehito Oonishi, Tsuyoshi Konishi, and Kazuyoshi Itoh
Appl. Opt. 46(22) 5019-5026 (2007)