All-silica fiber Bessel-like beam generator and its applications in longitudinal optical trapping and transport of multiple dielectric particles

SR Lee, J Kim, S Lee, Y Jung, JK Kim, K Oh - Optics express, 2010 - opg.optica.org
Optics express, 2010opg.optica.org
A Bessel-like beam was generated in a novel all-fiber integrated structure. A concentric ring
intensity pattern was achieved by the multimode interference along the coreless silica fiber,
which was then focused by the integrated micro-lens to result in a Bessel-like beam. The
average beam diameter of 7.5 μm maintained over 500 μm axial length for a continuous
wave Yb-doped fiber laser input oscillating at the wavelength of 1.08 μm. The generated
beam was successfully applied to two-dimension optical trapping and longitudinal transport …
A Bessel-like beam was generated in a novel all-fiber integrated structure. A concentric ring intensity pattern was achieved by the multimode interference along the coreless silica fiber, which was then focused by the integrated micro-lens to result in a Bessel-like beam. The average beam diameter of 7.5 μm maintained over 500 μm axial length for a continuous wave Yb-doped fiber laser input oscillating at the wavelength of 1.08 μm. The generated beam was successfully applied to two-dimension optical trapping and longitudinal transport of multiple dielectric particles confirming its unique non-diffracting and self-reconstructing nature. Physical principle of operation, fabrication, and experimental results are discussed.
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