Anti-bimeron in an asymmetric light field

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Abstract
Optical bimerons are topologically protected vector textures promising for communication, sensing, and information encoding. However, their generation traditionally relies on symmetric light fields, leaving asymmetric topological states largely unexplored. In this Letter, we experimentally generate anti-bimerons by superposing same-order asymmetric Laguerre–Gaussian (aLG) beams with conjugate complex shifts. The spatial symmetry breaking induced by these complex shifts facilitates the flexible construction of bimeron textures across various polarization bases. Furthermore, the identical Gouy phase between the superposed modes ensures topological stability during propagation. We elucidate how the asymmetry parameter modulates these robust structures during free-space propagation. This work enriches the paradigms of optical quasiparticle generation and provides a framework for leveraging light field asymmetry in topological information carriers.
Funding Information
  • National Natural Science Foundation of China (62375158)
  • National Natural Science Foundation of China (12374307)
  • Natural Science Foundation of Qingdao Municipality (25-1-1-153-zyyd-jch)
  • National Key Research and Development Program of China (2023YFA1406903)

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