Abstract
We propose and numerically verify a design of the photonic integrated circuit for in-plane generation of a 1st azimuthal order vortex mode in dielectric rectangular waveguides. Radiation is introduced into the proposed structure in a standard way through two grating couplers. Applying a mode coupling and specific phase shift, a field with the required amplitude-phase distribution is formed directly in the output waveguide. The geometric dimensions of the device are simulated and optimized to fit the technological parameters of the silicon-on-insulator platform.
Highlights
In recent years, optical beams carrying orbital angular momentum (OAM), so-called optical vortices, have attracted significant attention from researchers due to their specific properties
Generating TE10 directly from a grating coupler (GC) is a confusing technological problem, for which we propose to use a scheme based on a directional coupler (DC)
We propose a chip design for exciting a first-order optical vortex mode inside an integrated silicon waveguide
Summary
Optical beams carrying orbital angular momentum (OAM), so-called optical vortices, have attracted significant attention from researchers due to their specific properties. Most methods for out-of-plane generation demonstrate satisfactory mode purity of the output OAM beam, its free-space propagation requires a lens to focus the signal and couple it into the fiber, which negatively affects the reliability and size of the final device. Another disadvantage of this approach is the limited potential for multiplexing of optical vortices with different topological charges. A basic description of the proposed device is provided
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