The diffraction of light is a ubiquitous phenomenon in nature where waves spread out as they propagate. This spreading of light beams during propagation limits the efficient transmission of energy and information. Therefore, scientists have endeavored to suppress diffraction effects to better maintain the shape and direction of light beams.
Propagating dimensions of light: Deforming versatile non-diffractive beams along the optical trajectoryFigure 1. a) schematic illustration of AFCA and ADCA . b) Phase configuration of the metasurface, where the yellow arrows represent the local phase, and the red areas denote the global phase. c) Flowchart for obtaining the total phase through combined modulation of the local and global phase.
However, devices for modulating non-diffracting light fields have typically been bulky and have limitations such as low resolution and difficulty encoding the phase profile. Theand achieve multidimensional control of light fields through their birefringence. This technology is considered a key enabler for the development of next-generation photonic integrated platforms.
This research was made possible by our proposed mechanism of joint local-global phase control, allowing us not only to modulate the radial phase gradient, but also to facilitate the encoding of more complex, non-diffracting optical fields. The work isFigure 2. Illustrations of CABs modulated by local phase and global phase, respectively. a, c, e, and g depict schematic diagrams of the ray configurations, while b, d, f, and h showcase the corresponding effect diagrams. Scale bar, 10 μm.
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