Photopolymerization is a powerful technique to create arbitrary micro-objects with a high spatial resolution. Importantly, to date all photopolymerization studies have been performed with incident light fields with planar wavefronts and have solely exploited the intensity profile of the incident beam. We investigate photopolymerization with light fields possessing orbital angular momentum, characterized by the topological charge l. We show both experimentally and theoretically that, as a consequence of nonlinear self-focusing of the optical field, photopolymerization creates an annular-shaped vortex-soliton and an associated optical fiber, which breaks up into |l| solitons or microfibers. These microfibers exhibit helical trajectories with a chirality determined by the sign of l due to the orbital angular momentum of the light field and form a bundle of helical-microfibers. This research opens up a new application for light fields with orbital angular momentum, and our generated microfibers may have applications in optical communications and micromanipulation.
Bibliographical noteFunding Information:
The authors acknowledge support from Grant-in-Aid for Scientific Research (Nos. JP 15H03571; JP 15K13373; JP 16K04971) from the Japan Society for the Promotion of Science (JSPS). We also acknowledge a financial support from JSPS KAKENHI Grants (JP 16H06507; JP 17K19070; JP 18H03884). P.P. is supported by the Air Force Office of Scientific Research (AFOSR) under Contract No. FA9550-16-1-0088 and by Office of Naval Research Multidisciplinary University Research Initiative (MURI) grant No N00014-17-1-2705. We thank the UK Engineering and Physical Sciences Research Council for support through Grant EP/P030017/1. We thank Dr. Graham D. Bruce, University of St Andrews, for useful discussions.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering