Cubic-phase metasurface for three-dimensional optical manipulation

Hsin Yu Kuo, Sunil Vyas, Cheng Hung Chu, Mu Ku Chen, Xu Shi, Hiroaki Misawa, Yu Jung Lu, Yuan Luo, Din Ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

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.

Original languageEnglish
Article number1730
JournalNanomaterials
Volume11
Issue number7
DOIs
Publication statusPublished - Jun 2021

Keywords

  • 3D optical manipulation
  • Dielectric metasurface
  • Vertically accelerated 2D Airy beam

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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