TY - JOUR AU - Turner, Mark D. AU - Saba, Matthias AU - Zhang, Qiming AU - Cumming, Benjamin P. AU - Schroder-Turk, Gerd E. AU - Gu, Min TI - Miniature chiral beamsplitter based on gyroid photonic crystals JA - Nat Photon PY - 2013/09/01/online VL - advance online publication SP - EP - PB - Nature Publishing Group SN - 1749-4893 UR - http://dx.doi.org/10.1038/nphoton.2013.233 L3 - 10.1038/nphoton.2013.233 M3 - Letter L3 - http://www.nature.com/nphoton/journal/vaop/ncurrent/abs/nphoton.2013.233.html#supplementary-information AB - The linearly polarizing beamsplitter is a widely used optical component in photonics. It is typically built from a linearly birefringent crystal such as calcite, which has different critical reflection angles for s- and p-polarized light, leading to the transmission of one linear polarization and angled reflection of the other. However, the analogue for splitting circularly polarized light has yet to be demonstrated due to a lack of natural materials with sufficient circular birefringence. Here, we present a nano-engineered photonic-crystal chiral beamsplitter that fulfils this task. It consists of a prism featuring a nanoscale chiral gyroid network and can separate left- and right-handed circularly polarized light in the wavelength region around 1.615 [micro]m. The structure is fabricated using a galvo-dithered direct laser writing method and could become a useful component for developing integrated photonic circuits that provide a new form of polarization control. ER -