Generation of a polarization insensitive Airy beam using an all-dielectric metasurface

Abstract

The Airy beam possesses some unusual properties, which are non-diffraction, self-healing, and a unique self-bending behavior. Previous works about metasurfaces have used geometric phase or plasma resonance to produce the Airy beam. However, the former requires a circular polarized light incident, while the latter has a large optical loss. In this paper, a polarization insensitive metasuface is designed to generate the Airy beam. It works in 635 nm, which is the working wavelength of the commonly used semiconductor laser. The nature of all-dielectric eliminates the ohmic loss improving the working efficiency of the metasurface. The efficiency of generating the Airy beam is approximately 58 %. Most important of all, the square nanopillar is easier to be realized in processing. The square structure can have a smooth side as in the case of processing equipment accuracy is not very high.