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Neutron interferometry has played a distinctive role in fundamental scienceand characterization of materials. Moir\'e neutron interferometers arecandidate next-generation instruments: they offer microscopy-like magnificationof the signal, enabling direct camera recording of interference patterns acrossthe full neutron wavelength spectrum. Here we demonstrate the extension ofphase-grating moir\'e interferometry to two-dimensional geometries. Ourfork-dislocation phase gratings reveal phase singularities in the moir\'epattern, and we explore orthogonal moir\'e patterns with two-dimensionalphase-gratings. Our measurements of phase topologies and gravitationallyinduced phase shifts are in good agreement with theory. These techniques can beimplemented in existing neutron instruments to advance interferometric analysesof emerging materials and precision measurements of fundamental constants.

Phase and contrast moir\'e signatures in two-dimensional cone beam interferometry