Spatially multiplexing combination of circular Airy beams via metasurface

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Abstract
Circular Airy beams exhibit self-healing, non-diffracting properties for enhanced environmental resistance, and autofocusing capability. However, the peak power achievable from a single circular Airy beam remains insufficient for applications such as superhard material processing or high-energy laser confrontation. This paper proposes a method to multiplex circular Airy beams, which could enhance the light intensity at the position of focus. A metasurface is elaborately designed to integrats grating phase, circular Airy beam phase and achromatic compensation phase, which would regulates incident plane waves with the specific combination of oblique angle and wavelength to form a overlapping circular Airy beams with the same focal length in the output space. The focal length of the metasurface is 60 μ m, which could cover a working wavelength range of 450–600 nm, as well as an off-axis angle range of 26.7°–36.8° (with the grating period of 1 μ m) and 13°–17.4° (with the grating period of 2 μ m). When five circular Airy beams are multiplexed, the intensity of the overlapping output beam can be 9.1 times higher than that of a single beam. This work provides a new approach for generating high-power circular Airy beams, promising significant potential in laser confrontation and laser processing applications.
Funding Information
  • CAS Project for Young Scientists in Basic Research (YSBR-103)

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