In the microchannel 50, a conductive film 52 is formed on an electron input surface of a dynode 51 where the plurality of channels are arranged. The conductive film is made of material that can transmit light that has originated photoelectrons and that has a refractive index lower than that of the dynode...http://www.google.com.au/patents/US5923120?utm_source=gb-gplus-sharePatent US5923120 - Microchannel plate with a transparent conductive film on an electron input surface of a dynode
