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Title: Cubic-phase metasurface for three-dimensional optical manipulation
Authors: Kuo, HY
Vyas, S
Chu, CH
Chen, MK 
Shi, X
Misawa, H
Lu, YJ
Luo, Y
Tsai, DP 
Issue Date: Jul-2021
Source: Nanomaterials, July 2021, v. 11, no. 7, 1730
Abstract: 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.
Keywords: 3D optical manipulation
Dielectric metasurface
Vertically accelerated 2D Airy beam
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Nanomaterials 
ISSN: 2079-4991
DOI: 10.3390/nano11071730
Rights: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The following publication Kuo, H.Y.; Vyas, S.; Chu, C.H.; Chen, M.K.; Shi, X.; Misawa, H.; Lu, Y.-J.; Luo, Y.; Tsai, D.P. Cubic-Phase Metasurface for Three-Dimensional Optical Manipulation. Nanomaterials 2021, 11, 1730 is available at https://doi.org/10.3390/nano11071730
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