6 February 2008 Three-dimensional chiral photonic crystals by direct laser writing
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We review our recent work on three-dimensional chiral photonic crystals. High-quality polymeric three-dimensional spiral and layer-by-layer photonic crystals are fabricated via direct laser writing. Polarization stop bands for circularly polarized light are observed, leading up to a suppression of a factor 52 for one circular polarization with respect to the other. The transmittance for the passing polarization is as high as 95 % . These chiral elements are sandwiched between one-dimensional lamellae structures acting as quarterwave plates to form thin-film polarizers, which can be operated under perpendicular incidence.
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Michael Thiel, Michael Thiel, Martin Wegener, Martin Wegener, Georg von Freymann, Georg von Freymann, "Three-dimensional chiral photonic crystals by direct laser writing", Proc. SPIE 6883, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics, 68830K (6 February 2008); doi: 10.1117/12.762575; https://doi.org/10.1117/12.762575

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