All-fiber self-accelerating Bessel-like beam generator and its application.

Area of Science:

• Photonics and Optical Engineering
• Microfluidics and Nanotechnology
• Biomedical Optics

Background:

• Bessel beams are known for their non-diffracting and self-reconstructing properties.
• Optical trapping and manipulation of microparticles are crucial in various scientific fields.
• Existing methods for generating self-accelerating beams often involve complex free-space optics.

Purpose of the Study:

• To demonstrate an all-fiber generator for transverse self-accelerating Bessel-like beams.
• To investigate the properties and applications of these beams in optical trapping.
• To provide a simpler, more integrated alternative to free-space optical setups.

Main Methods:

• Fabrication of a Bessel-like beam generator by splicing single-mode and multimode fibers with an offset.
• Modulation of the output light beam phase using a hemispherical-lens fiber tip.
• Theoretical and experimental verification of beam properties and optical trapping capabilities.

Main Results:

• Successful generation of a transverse self-accelerating Bessel-like beam with a high acceleration rate (∼10⁻⁴ μm⁻¹).
• Demonstration of microparticle transport along bending trajectories using the generated beam.
• High consistency between experimental observations and simulation results.

Conclusions:

• The all-fiber generator offers a simple, highly integrated, and compact solution for producing transverse self-accelerating Bessel-like beams.
• This technology presents a novel method for precise microparticle manipulation with bending trajectories.
• The developed system is a significant advancement for high-precision biological cell experiments and manipulations.