Abstract

In the framework of scalar diffraction theory, binary digital holograms and Dammann gratings generate symmetric intensity distributions as diffraction patterns. If asymmetric signals are of interest, either an offset from the optical axis has to be introduced or more quantization levels have to be used. We show that a synthesis on the basis of rigorous diffraction theory permits binary elements with subwavelength features to realize on-axis asymmetric signals.

© 1995 Optical Society of America

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