Mode division multiplexing technology for single-fiber optical trapping axial-position adjustment.
We demonstrate trapped yeast cell axial-position adjustment without moving the optical fiber in a single-fiber optical trapping system. The dynamic axial-position adjustment is realized by controlling the power ratio of the fundamental mode beam (LP01) and the low-order mode beam (LP11) generated in a normal single-core fiber. In order to separate the trapping positions produced by the two mode beams, we fabricate a special fiber tapered tip with a selective two-step method. A yeast cell of 6 μm diameter is moved along the optical axis direction for a distance of ~3 μm. To the best of our knowledge, this is the first demonstration of the trapping position adjustment without moving the fiber for single-fiber optical tweezers. The excitation and utilization of multimode beams in a single fiber constitutes a new development for single-fiber optical trapping and makes possible more practical applications in biomedical research fields.
Photonics Research Center, College of Science, Harbin Engineering University, Harbin, China. zhihai@vip.sina.com
Zhihai
Z
Liu
Lei
L
Wang
Peibo
P
Liang
Yu
Y
Zhang
Jun
J
Yang
Libo
L
Yuan
D055100:Optical Fibers; D052898:Optical Tweezers; D012441:Saccharomyces cerevisiae / Q000166:cytology