At Twelve Orals of Matter Scientists Next meeting November 20th, 2014 at 14:00 in room S, Physics Dpt Michele Gintoli Dipartimento di Fisica e Astronomia "G. Galilei Università degli Studi di Padova Vortex phase masks for structured light generation in superresolution imaging systems Abstract: The use of optical elements able to imprint a vortex pattern to the phase distribution of a light beam has brought to us the possibility to overcome the resolution limit represented by Abbe’s criterion. In astronomy, the vortex coronagraph is able to “peek through” the light of bright stars and resolve adjacent, weaker secondary sources, thanks to the peculiar filter ability of a doubly charged vortex phase mask. In microscopy, single charge vortex phase plates can be used both as filters to achieve drastic contrast enhancements (spiral phase contrast imaging), or as means to generate robust “doughnut” beams, indispensable for the now famous STED (STimulated Emission Depletion) microscopy technique. STED microscopy, in particular, will be the occasion to experiment with different, more complex vortex designs, such as combinations of p > 0 Laguerre-Gauss beams.
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