Chongfan Technology
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09
2026
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04
Intensity-Asymmetric Wavefront Shaping in Nonlocal Metasurfaces
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A team led by Din Ping Tsai and Yubin Fan at City University of Hong Kong, in collaboration with a team led by Shumin Xiao at Harbin Institute of Technology, has proposed a metasurface lens that effectively integrates localized Mie resonances with delocalized quasi-continuous-wave bound states while precisely controlling the interaction between the two. This hybrid design requires no additional layers yet delivers highly directional response arising from the asymmetry of the silica substrate, all while maintaining high nonlinear efficiency and robust phase modulation. Experimental results demonstrate that the lens can achieve directional focusing across the fundamental wavelength as well as its second- and third-harmonic bands, with a maximum forward-to-backward power ratio exceeding 10 dB. This work opens up new opportunities for nonreciprocal LiDAR and photonic computing applications.
The research findings were published in Nature Communications on January 26, 2026, under the title “Intensity-asymmetric wavefront shaping in nonlocal meta-lens.”
Figure 1: Nonlocal metasurface lens for asymmetric nonlinear wavefront shaping
Figure 2: Design Principle and Numerical Simulation of the Integrated Resonant Unit
Figure 3: Asymmetric Focusing in Harmonic Generation
Figure 4: Asymmetric Focusing at the Fundamental Frequency
Source: Optics World
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