A symmetric achiral trilayer structure, which consists of a high-index center layer sandwiched between two identical low-index films and embedded in a high-index prism, is designed to produce equal and opposite quarter-wave retardation in reflection and transmission and equal throughput for the p and s polarization at oblique incidence. Such a device splits a beam of incident linearly polarized light into two orthogonally circularly polarized components of equal power that travel in different directions. A visible (633-nm) design that operates at a 60° angle of incidence and an infrared (10.6-μm) 45° cube design are presented. The spectral and angular sensitivities of the device are also considered.
© 2003 Optical Society of America
R. M. A. Azzam and A. De, "Circular polarization beam splitter that uses frustrated total internal reflection by an embedded symmetric achiral multilayer coating," Opt. Lett. 28, 355-357 (2003)