Bard College at Simon's Rock 1 article published in JoVE Engineering Fourier-Based Diffraction Analysis of Live Caenorhabditis elegans Jenny Magnes1, Harold M. Hastings2, Kathleen M. Raley-Susman3, Clara Alivisatos1, Adam Warner1, Miranda Hulsey-Vincent1 1Physics and Astronomy Department, Vassar College, 2 This manuscript describes how to distinguish different nematodes using far-field diffraction signatures. We compare the locomotion of 139 wild type and 108 "Roller" C. elegans by averaging frequencies associated with the temporal Fraunhofer diffraction signature at a single location using a continuous wave laser.