Heidelberg 2015 – scientific programme

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SYTL: Symposium Interactions between Twisted Light and Particles

SYTL 2: Symposium on interactions between twisted light and particles II (SYTL)

SYTL 2.4: Talk

Friday, March 27, 2015, 15:50–16:10, C/gHS

Design and realisation of variable C shaped structured illumination — •Michael Mousley, Jun Yuan, Mohamed Babiker, and Gnanavel Thirunavukkarasu — University of York, UK

Computer generated holograms (CGHs) have been designed to create structured illumination with a C shape. The structured illumination is based on a vortex state, however the inclusion of radial phase gradients leads to non integer topological charge and a redistribution of intensity in the far field diffraction pattern. By analysing the phase gradients present in the wavefunction the structured illumination pattern can be predicted and independent control of the radius and opening angle is possible. C shaped illumination is experimentally produced in an electron microscope showing two different opening angles , using two different CGH mask types. C-shaped structured illumination offers interesting particle interactions and trapping possibilities with the ability to control the size of the gap between trapped particles at the ends of the intensity curve. C shaped illumination promises potential applications both in the optical and electron beam lithography of metamaterials which utilise split ring structures and dimensions as small as nanometres can be achieved in the electron beam case.