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Three-dimensional chiral microstructures fabricated by structured optical vortices in isotropic material.
Jincheng Ni1, Chaowei Wang1, Chenchu Zhang1
1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, China.
Light, Science & Applications
|September 1, 2018
Summary
Researchers created 3D chiral microstructures in isotropic polymers using coaxial interference of optical vortex and plane beams. This technique enables precise control over chirality for advanced material fabrication.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Optical vortices create helical phase wavefronts and doughnut-shaped intensity profiles.
- Previous applications fabricated chiral structures in metals and anisotropic polymers.
- Isotropic polymers typically yield non-chiral cylindrical microstructures due to 2D vortex profiles.
Purpose of the Study:
- To develop a novel strategy for fabricating three-dimensional (3D) chiral microstructures in isotropic polymers.
- To overcome the limitations of 2D optical vortex profiles in isotropic materials.
- To achieve controllable chirality in fabricated microstructures.
Main Methods:
- Coaxial interference of an optical vortex beam and a plane wave to generate 3D spiral optical fields.
- Utilizing liquid-crystal spatial light modulators with designed holograms (azimuthal phase and equiphase).
- Illuminating isotropic polymers with femtosecond laser beams generated through this interference method.
Main Results:
- Successfully fabricated 3D chiral microstructures in isotropic polymers.
- Demonstrated control over the chirality of microstructures by adjusting the topological charge of the vortex beam.
- Identified interfering patterns and helical phase wavefronts as the cause of spiral lobes and chirality.
Conclusions:
- A powerful and simple strategy for creating 3D chiral microstructures in isotropic materials has been developed.
- The technique offers precise control over chirality, essential for advanced material applications.
- Potential applications include optical tweezers, optical communications, and rapid metamaterial fabrication.
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