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arXiv · 1007.4239

Efficient generation and control of different order orbital angular momentum states for communication links

Sergei Slussarenko·Ebrahim Karimi·Bruno Piccirillo·Lorenzo Marrucci·Enrico Santamato
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Abstract

We present a novel optical device to encode and decode two bits of information into different Orbital Angular Momentum (OAM) states of a paraxial optical beam. Our device generates the four angular momentum states of order $\pm 2$ and $\pm4$ by Spin-To-Orbital angular momentum Conversion (STOC) in a triangular optical loop arrangement. The switching among the four OAM states is obtained by changing the polarization state of the circulating beam by two quarter wave plates and the two-bit information is transferred to the beam OAM exploiting a single $q$-plate. The polarization of the exit beam is left free for additional one bit of information. The transmission bandwidth of the device may be as large as several megahertz if electro-optical switches are used to change the beam polarization. This may be particularly useful in communication system based on light OAM.

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Sergei Slussarenko, Ebrahim Karimi, Bruno Piccirillo, Lorenzo Marrucci, Enrico Santamato. 2010-07-24. Efficient generation and control of different order orbital angular momentum states for communication links. https://doi.org/10.1364/josaa.28.000061

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