Physics – Optics
Scientific paper
2010-07-24
J. Opt. Soc. Am. A 28, 61-65 (2011)
Physics
Optics
5 pages, 5 figures, 1 table. Submitted
Scientific paper
10.1364/JOSAA.28.000061
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.
Karimi Ebrahim
Marrucci Lorenzo
Piccirillo Bruno
Santamato Enrico
Slussarenko Sergei
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