Intensity-asymmetric wavefront shaping in nonlocal meta-lens

Asymmetric wavefront shaping can unlock essential functionalities for next-generation photonic systems, such as unidirectional transmission, nonlinear signal routing, and nonreciprocal light control. However, achieving these functionalities in passive nonlinear metasurfaces remains challenging due to the required trade-offs among nonlinear efficiency, phase modulation, and directional asymmetry, particularly on low-index substrates with weak intrinsic asymmetry. Here, we propose a meta-lens that effectively integrates local Mie-type resonances with nonlocal quasi-bound states in the continuum, tailoring their interaction. Without any additional layers, this hybrid design produces a strong directional response…

• CU
  City University of Hong Kong

  Awards: Project No. 9380131, 9380131
• NN
  National Natural Science Foundation of China

  Awards: 62125501, Grant No. 62375232, 6233000076, 523B2053, 62375232