4.5 Article

Rapid fabrication of microrings with complex cross section using annular vortex beams

Journal

CHINESE OPTICS LETTERS
Volume 20, Issue 2, Pages -

Publisher

OSA-OPTICAL SOC
DOI: 10.3788/COL202220.023801

Keywords

microfabrication; femtosecond laser; structural beams; microring

Categories

Funding

  1. National Natural Science Foundation of China [62005262, 51875160]
  2. Fundamental Research Funds for the Central Universities [PA2020GDSK0077, PA2020GDKC0010]

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In this study, a ring-shaped focus with controllable gaps was proposed by multiplexing the vortex beam and annular beam. The multiplexed beam has advantages such as individual control of diameter and flow energy of the focal point, unaffected by the zero-order beam.
A ring-shaped focus, such as a focused vortex beam, has played an important role in microfabrication and optical tweezers. The shape and diameter of the ring-shaped focus can be easily adjusted by the topological charge of the vortex. However, the flow energy is also related to the topological charge, making the individual control of diameter and flow energy of the vortex beam impossible. Meanwhile, the shape of the focus of the vortex beam remains in the hollow ring. Expanding the shape of focus of structural light broadens the applications of the vortex beam in the field of microfabrication. Here, we proposed a ring-shaped focus with controllable gaps by multiplexing the vortex beam and annular beam. The multiplexed beam has several advantages, such as the diameter and flow energy of the focal point can be individually controlled and are not affected by the zero-order beam, and the gap size and position are controllable.

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