Double Slit Experiment Still Has Much to Offer (2): Extended-Which-Way Experiments--- Violating Complementarity Principle

Young's 1D-dimension-double-slit experiments represent the basic mystery of quantum world and was extended to which-way-1D-double-slit experiment. To explore the mystery, 2D-cross-double-slit diaphragm have been proposed, which consists of more than one double-slits intersecting to each other at the same spot. In this article, the extended which-way 2D cross-double slit experiments are presented to test the normal interpretation of the which way experiments. The experimental results show that photons passing through the detected double-slit behave as particle, while photons passing through other undetected double-slit(s) distribute as wave in the same experiment with the same diaphragm. Namely the particle nature and wave distribution coexist, which violates Bohr's complementarity principle. It is a challenge to interpret those observations consistently.