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13 March 2020 Generation of arbitrary higher order Poincaré beams from a visible metasurface laser
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Abstract
The use of beams carrying orbital angular momentum (OAM) has become ubiquitous and topical in a variety of research fields. More recently, there has been a growing interest in exotic OAM carrying beams with spatially variant polarisation, so called Poincaré sphere beams. Structuring these beams at the source gives rise to compact solutions for a myriad of applications, from laser materials processing to microscopy. Here we present a visible laser that control's the angular momentum of light by arbitrary spin-orbit (SO) momentum conversion using novel metasurface devices. Further, we outline how to generate high purity OAM states in a deterministic manner with charge up to 100. Finally, we demonstrate the generation of symmetric and non-symmetric vector vortex beams from the same source with a large OAM differential between modes of up to 90. The performance and versatility in design of our approach offers a route to control light's angular momentum at the source.
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Hend Sroor, Yao-Wei Huang, Bereneice Sephton, Darryl Naidoo, Adam Valles, Vincent Ginis, Qiwen Zhan, Cheng-Wei Qiu, Antonio Ambrosio, Federico Capasso, and Andrew Forbes "Generation of arbitrary higher order Poincaré beams from a visible metasurface laser", Proc. SPIE 11266, Laser Resonators, Microresonators, and Beam Control XXII, 112660L (13 March 2020); https://doi.org/10.1117/12.2546267
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