Cubic-Phase Metasurface for Three-Dimensional Optical Manipulation.
Cubic-Phase Metasurface for Three-Dimensional Optical Manipulation.
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DOI：
10.3390/nano11071730
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发表时间：
2021-06-30
期刊：
影响因子：
--
通讯作者：
Tsai DP
中科院分区：
文献类型：
--
作者：
Kuo HY;Vyas S;Chu CH;Chen MK;Shi X;Misawa H;Lu YJ;Luo Y;Tsai DP
光镊是生物学研究中非接触操作的重要技术之一，用于控制微小物体的运动。对于三维（3D）光学操纵，成形光束已经被广泛使用。通常，空间光调制器用于对光场进行整形。然而，它们具有体积大、工作带宽窄以及入射偏振态的限制等缺点。在这里，设计和制造了一个由GaN圆形纳米柱组成的非晶相电介质超颖表面，以在可见光区域产生偏振无关的垂直加速二维（2D）艾里光束。实验证明了垂直加速二维艾里光束的独特传输特性，包括无衍射、自加速和自愈。配备立方相元表面的光学操作系统旨在对微米尺度颗粒进行3D操作。由于艾里光束的高强度梯度和互易传输轨迹，粒子可以沿轴向沿着横向移动和引导。此外，通过实验测量的捕获刚度定量地评估了光捕获的性能。我们的超颖表面在物理和生物应用领域的紧凑系统中具有巨大的潜力。
The optical tweezer is one of the important techniques for contactless manipulation in biological research to control the motion of tiny objects. For three-dimensional (3D) optical manipulation, shaped light beams have been widely used. Typically, spatial light modulators are used for shaping light fields. However, they suffer from bulky size, narrow operational bandwidth, and limitations of incident polarization states. Here, a cubic-phase dielectric metasurface, composed of GaN circular nanopillars, is designed and fabricated to generate a polarization-independent vertically accelerated two-dimensional (2D) Airy beam in the visible region. The distinctive propagation characteristics of a vertically accelerated 2D Airy beam, including non-diffraction, self-acceleration, and self-healing, are experimentally demonstrated. An optical manipulation system equipped with a cubic-phase metasurface is designed to perform 3D manipulation of microscale particles. Due to the high-intensity gradients and the reciprocal propagation trajectory of Airy beams, particles can be laterally shifted and guided along the axial direction. In addition, the performance of optical trapping is quantitatively evaluated by experimentally measured trapping stiffness. Our metasurface has great potential to shape light for compact systems in the field of physics and biological applications.
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