Abstract

A generic design and fabrication scheme of Mo/Si multilayer-grating phaseshift reflector systems is reported. Close to optimized extreme ultraviolet (EUV, $\lambda =13.5\mathrm{nm}$) reflectance values up to 64% are demonstrated, while the diffractive properties can be exploited in spectral filtering applications. The results can contribute to a wavelength-unspecific solution for the suppression of $\lambda >100\mathrm{nm}$ out-of-band radiation in EUV lithography.

©2012 Optical Society of America

Extreme ultraviolet multilayer mirror with near-zero IR reflectance

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