Output list
Conference proceeding
Dynamical arrest of topological defects in 2D hyperuniform disk packings
Published 2021
EPJ Web of Conferences, 249, 15002
Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media, 05/07/2021–06/08/2021, Buenos Aires (Virtual), Argentina
We investigate collective motions of points in 2D systems, orchestrated by Lloyd algorithm. The algorithm iteratively updates a system by minimising the total quantizer energy of the Voronoi landscape of the system. As a result of a tradeoff between energy minimisation and geometric frustration, we find that optimised systems exhibit a defective landscape along the process, where strands of 5- and 7-coordinated dislocations are embedded in the hexatic phase. In particular, dipole defects, each of which is the simplest possible pair of a pentagon and a heptagon, come into the picture of dynamical arrest, as the system freezes down to a disordered hyperuniform state. Moreover, we explore the packing fractions of 2D disk packings associated to the obtained hyperuniform systems by considering the maximum inscribed disks in their Voronoi cells.
Conference proceeding
Fabrication and Characterisation of Chiral Beamsplitters via Galvo-Dithered Direct Laser Writing
Published 2012
Frontiers in Optics 2012/Laser Science XXVIII
We demonstrate the fabrication of a chiral beamsplitter consisting of a biomimetic gyroid photonic crystal via a novel galvo-dithered direct laser writing method and provide experimental characterisation demonstrating the ability to redirect circularly polarized light.