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Kapitza-Dirac-Talbot-Lau interferometry (KDTLI) has recently been establishedfor demonstrating the quantum wave nature of large molecules. A phase spacetreatment permits us to derive closed equations for the near-field interferencepattern, as well as for the Moire-type pattern that would arise if themolecules were to be treated as classical particles. The model provides asimple and elegant way to account for the molecular phase shifts related to theoptical dipole potential as well as for the incoherent effect of photonabsorption at the second grating. We present experimental results for differentmolecular masses, polarizabilities and absorption cross sections usingfullerenes and fluorofullerenes and discuss the alignment requirements. Ourresults with C60 and C70, C60F36 and C60F48 verify the theoretical descriptionto a high degree of precision.

Theory and experimental verification of Kapitza-Dirac-Talbot-Lau interferometry