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Substrate-mode polarizing beam-splitter realized with sandwich reflection holograms recorded in DuPont photopolymer

We present a transmission holographic element that spatially separates the Transverse Electric (TE) and Transverse Magnetic (TM) polarization modes. This element can be used as a polarizing beam-splitter as well as an optical switch. Its originality is that it is compared of two reflection holograms stacked together with index matching glue or liquid. The former hologram is a mirror called 'substrate- mode hologram' (SMH) because of its diffraction angle higher than the internal reflection angle in the substrate. The second hologram is a mirror that only reflects the TE mode in accordance with the coupled wave theory. The main advantages of associating two reflection elements rather than transmission usual ones are a wider angular selectivity peak, a greater wavelength selectivity and the possibility to reach high diffractive efficiency with the SMH for both polarization modes. The high index modulation amplitude in the DuPont Omnidex photopolymer enables the recording of elements with high performance and permits to take benefit of the dry process in order to save the accurate grating geometry associated with desired properties. We propose an original design and discuss theoretical and experimental behaviors for green and red reading wavelengths.