Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures.

摘要: Recent advances in nanofabrication techniques are opening new frontiers holographic devices, with the capability to integrate various optical functions a single device. However, while most efficient holograms achieved reflection-mode configurations, they general opaque because of reflective substrate that must be used, and therefore, have limited applicability. Here, we present semi-transparent, computer-generated hologram is circularly-polarization dependent, reconstructs different wavefronts when viewed from sides. The integrated functionality realized using thin-film liquid crystal self-organized helical structure Bragg reflects circularly-polarized light over certain band wavelengths. Asymmetry depending on viewing side by exploiting penetration depth as well nature crystals conform orientational patterns imprinted two substrates sandwiching material. Also, operation wavelength determined reflection position, pseudo-color can made simply stacking layers designs. unique characteristics this may find applications polarization-encoded security see-through signage where information need displayed direction.