Abstract
Structuring light is an essential key to control optical forces, transfer signals, or enhance the capabilities of imaging systems [1, 2]. Micro-manipulation of particles as well as micro- and nano-scale material processing are based on light fields with spatially structured amplitudes, phases and polarizations [3, 4, 5, 6]. In order to tackle the mentioned tasks, predominantly the energy flow of spatially modulated light fields is exploited and preferentially tailored for the respective requirements. Spin angular momenta (SAM), based on the polarization structure, and orbital angular momenta (OAM), related to the gradients of amplitudes and phases, determine the energy flow, generally described by the Poynting vector [7]. In this work, we consider scalar light fields with spatially constant SAM, thus the OAM determines the spatial structure of the energy flow.
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