Parity-time symmetric micro ring vortex emitter
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An optical vortex (also known as a screw dislocation or phase singularity) is a light beam that twists along its travel directions with a spiral phase wave front. With the unique property of carrying phase information on the wave front as a type of spatial modulations, the optical vortex promises many potential applications for optical communications. Parity-time symmetric materials are of complex parity-time symmetric refractive index modulations and have demonstrated unique unidirectional light transport at the exceptional point. Typically, vortex beams are generated using spatial light modulators or other kinds of passive devices at a relatively large scale. In this thesis, based upon the theory of the unidirectional parity-time symmetric ring laser operated at the exceptional point, an on-chip integrated vortex laser working at the wavelength of λ=1550nm is designed, which has been numerically validated using the fullwave finite element simulations.