Transmittance is a measure of how much light passes through a material. It is related to the dielectric function, which describes the material's ability to polarize in response to an electric field, by the equation T = |E|^2/|E_0|^2, where E is the electric field after passing through the material and E_0 is the initial electric field.
To calculate transmittance across two boundaries, you need to know the dielectric function of each material and the angle of incidence of the light. The transmittance can then be calculated using the Fresnel equations, which take into account the refractive indices and the polarization of the light.
The transmittance across two boundaries is affected by several factors, including the refractive indices of the two materials, the angle of incidence of the light, the polarization of the light, and the thickness of the materials. The dielectric function of the materials also plays a crucial role in determining the transmittance.
No, the transmittance across two boundaries cannot be greater than 1. This would imply that more light is passing through the material than is initially present, which is physically impossible. The maximum transmittance value is 1, which corresponds to complete transmission of light through the material.
The dielectric function can be determined experimentally by measuring the reflectance and transmittance of light at different angles of incidence and using this data to calculate the refractive index of the material. The dielectric function can then be calculated using the relation n^2 = ε, where n is the refractive index and ε is the dielectric constant.