Jiang Qiang, Hu Leyong, Geng Guangzhou, Li Junjie, Wang Yongtian, Huang Lingling
Opt Express. 2022 Apr 11;30(8):13530-13539. doi: 10.1364/OE.454967.
Metasurfaces have been widely studied for arbitrary manipulation of the amplitude, phase and polarization of a field at the sub-wavelength scale. However, realizing a high efficiency metasurface with simultaneous and independent control of the amplitude and phase in visible remains a challenge. In this work, an ultrathin single-cell dielectric metasurface which can modulate arbitrary complex amplitude in transmission mode is proposed. The amplitude is controlled by adjusting the dipoles and quadrupoles by tuning the geometric size, while the phase is manipulated based on the Pancharatnam-Berry phase by rotating the meta-atom. Complex amplitude fields for generating holographic images and structure light are utilized to verify the reliability of the proposed structure. It has been experimentally demonstrated that the quality of holographic image of complex-amplitude hologram encoded on the proposed metasurface is better than that of phase-only holograms and verified by simulation that complex structure light can be generated by the proposed structure. Our work expands the superior limits of various applications, including arbitrary beam shaping, 3D biological imaging, optical computing, and optics-on-chip devices.
超表面已被广泛研究用于在亚波长尺度上对场的幅度、相位和偏振进行任意操纵。然而，在可见光范围内实现同时且独立控制幅度和相位的高效超表面仍然是一个挑战。在这项工作中，提出了一种超薄单细胞介质超表面，其可以在透射模式下调制任意复振幅。通过调整几何尺寸来调节偶极子和四极子来控制幅度，而基于潘查拉特纳姆 - 贝里相位通过旋转超原子来操纵相位。利用用于生成全息图像和结构光的复振幅场来验证所提出结构的可靠性。实验证明，编码在所提出超表面上的复振幅全息图的全息图像质量优于纯相位全息图，并通过模拟验证了所提出结构可以生成复杂结构光。我们的工作扩展了各种应用的上限，包括任意光束整形、三维生物成像、光学计算和片上光学器件。
