Relationship between microstructures and optoelectronic properties of Ag-O-Cs photoemitting surfaces: TheS-1 photocathode

Abstract

The S-1 photocathode is a prime example of a heterogeneous composite whose optical and electronic transport properties have been measured by many researchers. It provides an excellent system for testing theories of composites which replace a heterogeneous system of individual components having different physical properties with a homogeneous one having averaged physical properties depending on those of the components, the so-called effective-medium approximation. Using a recently formulated self-consistent dynamic effective-medium approximation that reduces to the requirement that ${\epsilon }_{\mathrm{eff}}$ be chosen so that the forward scattering amplitude of the particles embedded in the medium should vanish on the average, we present a theoretical investigation of the optical, electronic-transport, and photoemission behavior of S-1 photocathodes with various microstructures.