V Contents V VII Part I: 1 Driving optical micromachines with orbital angular momentum 3 Vincent L. Y. Loke, Theodor Asavei, Simon Parkin, Norman R. Heckenberg, Halina Rubinsztein-Dunlop, Timo A. Nieminen 1.1 Introduction 3 1.2 Symmetry, scattering, and optically-driven micromachines 3 1.3 Experimental demonstration 6 1.3.1 A preliminary design 7 1.3.2 Fabrication 7 1.3.3 Optical trapping and rotation 7 1.3.4 Optical measurement of torque 9 1.3.5 Discussion 10 1.4 Computational optimisation of design 12 1.4.1 Computational modelling of microrotors 12 1.4.2 Performance of four-armed rotor 15 1.4.3 Discussion 22 Light with Orbital Angular Momentum. J. P. Torres Copyright c  2009 WILEYVCH Verlag GmbH & Co. KGaA, Weinheim ISBN: