Dual BEF Surface
The Dual Brightness Enhancement Film (BEF) Surface is an idealized surface that can reflect and transmit rays with variable amplitude depending upon the polarization state of the ray. The surface is always a rectangular plane, and may not have any material, coatings, or scattering function applied. The surface may be embedded in any isotropic, homogeneous medium. If either ray splitting or polarization is off, the surface has no optical effect. Otherwise, any incident ray is split into a transmitted ray and a reflected ray. The transmission and reflection intensity coefficients are defined as parameters 3-6, and are different for X and Y polarized light, where the X and Y directions are defined in the surface coordinate system. The transmission and reflection for X polarized light may not exceed 1, and the same limit applies to Y polarized light.
When we set reflection X=1, the component that is not along the x-direction will be passed through object Dual BEF Surface w/a polarization vector orthogonal to the propagation direction. It will be transmitted.
Note that both reflected and transmitted electric fields must remain orthogonal to the respective ray vectors, and so for some combinations of incident angle, polarization state, and coefficient values, energy in the transmitted and/or reflected rays may not be conserved. If the transmitted or reflected energy is greater than the incident energy, OpticStudio will scale the energy to the incident intensity. In rare cases the sum of the transmitted and reflected energy may not obey energy conservation. The 6 parameters used to define this object are:
| Parameter # | Description | Face Name | Face # |
| 1 | X Half Width. | All Faces | 0 |
| 2 | Y Half Width. | All Faces | 0 |
| 3 | Reflection X | All Faces | 0 |
| 4 | Reflection Y | All Faces | 0 |
| 5 | Transmission X | All Faces | 0 |
| 6 | Transmission Y | All Faces | 0 |
Face Numbers: All faces Face 0
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