This illustrates the idea behind the wave-particle duality, which is shown here in a an unusual setting, to illustrate the universality of quantum phenomena:
Entire dye molecules are diffracted as quantum waves at a nanoscale material grating. The unusual aspect here is that even the skeleton of a natural alga – amphipleura pellucida – can serve as a diffraction grating.
This is a video abstract that went along with the respective publication in
M. Sclafani, T. J. Juffmann, C. Knobloch, M. Arndt,
Quantum coherent propagation of complex molecules through the frustule of the alga Amphipleura
New Journal of Physics 15, 083004 (2013), DOI: 10.1088/1367-2630/15/8/083004