Neutron supermirror

A neutron supermirror is a highly polished, layered material used to reflect neutron beams. Supermirrors are a special case of multi-layer neutron reflectors with varying layer thicknesses.[1]

Supermirrors are produced by depositing and polishing large numbers of layers of a reflecting substance, such as silicon, nickel, titanium or nickel/titanium composite, on a substrate. In this way, the critical angle of total reflection becomes ${\displaystyle n\cdot \theta _{c}}$, where ${\displaystyle n}$ is the number of layers and ${\displaystyle \theta _{c}}$ the angle of total reflection for a single layer.

References

1. Chupp, T. "Neutron Optics and Polarization" (PDF). Retrieved 16 April 2019.