Authors: Menglin L. N. Chen, Li Jun Jiang, and Wei E. I. Sha
Source: FERMAT, Volume 20, Communication 12, Mar-Apr., 2017
Abstract: Electromagnetic (EM) waves with helical wavefront carry orbital angular momentum (OAM), which is associated with the azimuthal phase of the complex electric field. OAM is a new degree of freedom in EM waves and is promising for channel multiplexing in communication system. Although the OAM-carrying EM wave attracts more and more attention, the method of OAM generation at microwave frequencies still faces challenges, such as efficiency and simulation time. In this work, by using the circuit theory and equivalence principle, we build two simplified models, one for a single scatter and one for the whole metasurface to predict their EM responses.
Keywords: Orbital angular momentum, ultrathin complementary metasurface, circuit theory, equivalence principle, Babinet’s principle.
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Orbital Angular Momentum Generation Using a Bi-Layered Complementary Metasurface with a High Conversion Efficiency