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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 16 — Jun. 1, 2008
  • pp: 2906–2914

Aperiodic multilayers with enhanced reflectivity for extreme ultraviolet lithography

Michele Suman, Maria-Guglielmina Pelizzo, Piergiorgio Nicolosi, and David L. Windt  »View Author Affiliations


Applied Optics, Vol. 47, Issue 16, pp. 2906-2914 (2008)
http://dx.doi.org/10.1364/AO.47.002906


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Abstract

We have developed novel aperiodic multilayers, covered by capping layers resistant to environmental attack, that offer superior performance for extreme ultraviolet lithography. We have designed these coatings using an optimization procedure based on an algorithm able to acquire domain knowledge inside the space of possible solutions. An integrated intensity increase of up to 2.18 times that obtained using standard periodic multilayers has been estimated. The aperiodic structures have minimal absorption in the topmost layers, which makes them especially insensitive to both the choice of capping layer material and any subsequent capping layer degradation due to oxidation or contamination. This property allows for the use of the most resilient capping layer materials available, thereby leading to a significantly improved lifetime. We have produced prototype capped aperiodic coatings and have measured their performance.

© 2008 Optical Society of America

OCIS Codes
(220.3740) Optical design and fabrication : Lithography
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(310.4165) Thin films : Multilayer design

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: January 9, 2008
Revised Manuscript: April 23, 2008
Manuscript Accepted: April 28, 2008
Published: May 21, 2008

Citation
Michele Suman, Maria-Guglielmina Pelizzo, Piergiorgio Nicolosi, and David L. Windt, "Aperiodic multilayers with enhanced reflectivity for extreme ultraviolet lithography," Appl. Opt. 47, 2906-2914 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-16-2906


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