Figure 5: Chiral photonic crystal structure for polarization control directly on an optical fibre tip.
From: Sub-micrometre accurate free-form optics by three-dimensional printing on single-mode fibres
(a) Illustration of the ‘twisted woodpile’. (b) Coloured scanning electron microscope image of the fabricated left-handed structure (blue) containing a solid ring (green) in order to increase the stability and reduce deformation of the structure. (c,d) Measured transmittance spectra for right- and left-handed circularly polarized light for the chiral photonic crystal at the in-/out-coupling end facet of the optical fibre and for the left- and right-handed photonic crystal structure, respectively. The design wavelength for the polarization filter was 1,550 nm. Scale bar, 10 μm (b).
