Neutron supermirror
（重定向自Supermirror）
![](/Images/godic/202502/14/Neutron.svg4820.png")
A neutron supermirror is a highly polished surface used in connection with neutron beams.
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 ![n\cdot \theta _{c}](/Images/godic/202502/14/accee4696651ee4bcfd6add4af18f3124820.png")
, where ![n](/Images/godic/202502/14/7b8b965ad4bca0e41ab51de7b31363a14820.png")
is the number of layers and ![\theta _{c}](/Images/godic/202502/14/a67803ea6b48a0b649d4890c5554123c4820.png")
the angle of total reflection for a single layer.