Helical microfibers created by photopolymerization with light fields possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita; Junhyung Lee; Shunsuke Toyoshima; Katsuhiko Miyamoto; Paris Panagiotopoulos; Ewan Wright; Kishan Dholakia; Takashige Omatsu

doi:10.1117/12.2323222

17 September 2018 Helical microfibers created by photopolymerization with light fields possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita, Junhyung Lee, Shunsuke Toyoshima, Katsuhiko Miyamoto, Paris Panagiotopoulos, Ewan Wright, Kishan Dholakia, Takashige Omatsu

Author Affiliations +

Proceedings Volume 10723, Optical Trapping and Optical Micromanipulation XV; 1072324 (2018) https://doi.org/10.1117/12.2323222
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Photopolymerization, the process of using ultraviolet light to activate polymerization within resins, is a powerful approach to create arbitrary, transparent micro-objects with a resolution below the diffraction limit. Such microstructures have been optimized for optical manipulation and are finding application elsewhere, including micro-optics, mechanical microstructures and polymer crystallography. Furthermore, due to self-focusing, photopolymerization can form a waveguide, which develops into an optical fibre as long as submillimeters. Importantly, to date virtually all photopolymerization studies have been performed with incident light fields possessing planar wavefronts and simply exploit the beam intensity profile. Here we investigate photopolymerization of ultraviolet curing resins with a light field possessing orbital angular momentum (OAM). We show that the annular vortex beam breaks up via modulation instability into the m-microfibers, depending on the azimuthal index m of an incident optical vortex. These microfibers exhibit helical structures with chirality determined by the sign of m and mirror the helical nature of the incident vortex beam wavefront. We have developed a numerical model based on the Beam Propagation Method that captures the key experimental observations for a variety of optical vortices characterized by their azimuthal index m. This research opens up a range of new vistas and has broad consequences for the fields of structured light, new approaches to writing novel mesoscopic structures and applications such as in detecting or sorting the OAM mode (e.g. photonic lanterns) in areas including optical communications and manipulation.

Conference Presentation

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Yoshihiko Arita, Junhyung Lee, Shunsuke Toyoshima, Katsuhiko Miyamoto, Paris Panagiotopoulos, Ewan Wright, Kishan Dholakia, and Takashige Omatsu "Helical microfibers created by photopolymerization with light fields possessing orbital angular momentum (Conference Presentation)", Proc. SPIE 10723, Optical Trapping and Optical Micromanipulation XV, 1072324 (17 September 2018); https://doi.org/10.1117/12.2323222

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KEYWORDS

Photopolymerization

Optical vortices

Ultraviolet radiation

Wavefronts

Crystallography

Diffraction

Micro optics

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