Neutron Optics and Diffraction

Very cold neutron optic setup @PF2, Institut Laue-Langevin, Grenoble, France

Neutron optical experiments are based on diffractive optical elements. We prepare grating structures by various methods (e.g. light optical holography or self assembly of colloids) in soft matter and employ them for diffracting (very) cold neutrons.  Gratings for these neutrons nowadays can be designed to serve as 3-port and 2-port beam-splitters, as well as a mirror. In addition three of them are assembled in a row to form a triple-Laue interferometer for cold neutrons. To implement magnetic interactions additionally we functionalize the structures via (superpara)magnetic nanoparticles.

Neutron holographic image of Palladium hydride.

We have a long tradition in doing elastic and inelastic neutron scattering experiments to investigate solid state matter, mainly by employing triple axis-spectrometers. On the contrast we pioneered neutron holography with picometer resolution, which is a novel technique introduced during the last decade. In order to overcome the drawback of prohibitively long measuring times the use of multidetectors for the recording of neutron holograms was explored. By using large detector arrays, simultaneous acquisition of a series of holograms with neutrons of different wavelengths is possible. Such a set-up corresponds to the method of multiple energy X-ray holography recently employed in synchroton radiation studies.

Selected publications