Wavelength selection for multilayer coatings for the lithography generation beyond EUVL

Makhotkin, I.A. and Zoethout, E. and Louis, E. and Yakunin, A.M. and Muellender, S. and Bijkerk, F. (2012) Wavelength selection for multilayer coatings for the lithography generation beyond EUVL. In: Extreme Ultraviolet (EUV) Lithography III (San Jose, California, USA), Amsterdam.

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Abstract:	The spectral properties of LaN/B and LaN/B4C multilayer mirrors have been investigated in the 6.5-6.9 nm wavelength range, based on measured B and B4C optical constants. We show that the wavelength of optimal single mirror reflectance for boron based optics is between 6.63 and 6.65 nm, depending on the boron chemical state. The wavelength of the maximum reflectance of the LaN/B4C multilayer system is confirmed experimentally. Calculations of the wavelengthintegrated reflectance for ideal 10-multilayer-mirror stacks show that a B-based optical column can be optimized for a wavelength larger than 6.65 nm.
Item Type:	Conference or Workshop Item
Research Group:	Laser Physics and Nonlinear Optics (LPNO)
Link to this item:	http://purl.utwente.nl/publications/81732
Official URL:	http://dx.doi.org/10.1117/12.918036
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