Yoshihiko Arita, Jun Hyung Lee, Haruki Kawaguchi, Reimon Matsuo, Katsuhiko Miyamoto, Kishan Dholakia, and Takashige Omatsu

Opt. Lett. (in press)

We study photopolymerization with high-order Bessel light beams with phase singularities on-axis. Self-trapping and self-focusing of the propagation-invariant light beams in a photopolymer allow the fabrication
of extended helical microfibers with a length scale of a centimeter, which is more than an order of magnitude larger than the propagation distance of the Bessel light beams. We show the evolution of microfibers rotating at a rate proportional to the incident optical power, while the periodicity of the helical structures remains constant irrespective of the laser power. This suggests that optical momentum transfer playing a predominant role in the growth and rotation of such fiber structures.