Creation of galaxy-shaped vortex relief structures in azo-polymers with petal-like beams

PLUTO / PLUTO-2 Spatial Light Modulators
Complex Modulation Higher Order Modes / Optical Vortex / OAM
Published on:
Authors: Arata Tomita, Adam Vallés, Katsuhiko Miyamoto, and Takashige Omatsu
Abstract:

We demonstrate the formation of surface relief structures in azo-polymers which exhibit multiple spiral arms, through irradiation of a rotating petal-like beam formed by the coherent superposition of Laguerre-Gaussian modes with opposite handedness. Intriguingly, the fabricated relief structures reflect full geometric parameters of the irradiated petal beam, such as handedness, topological charge, initial azimuthal phase and even ellipticity, corresponding to azimuthal and polar angles along equator and meridian planes of an orbital Poincaré sphere. The handedness, or direction of rotation, of the fabricated structures with multiple spiral arms could be controlled via the rotation and polarization directions of the irradiating laser field. This effect highlights an exotic coupling between the optical intensity gradient induced mass transport of the irradiated material and the spin angular momentum characteristics of the irradiating optical field. The azimuthal orientation of the surface relief structures could also be tuned by altering the initial relative phase between the coherently superposed Laguerre-Gaussian modes with opposite handedness, constituting the irradiating petal laser field. This work offers new insights into fundamental interactions which occur between light and matter, and we believe, will pave the way towards advanced technologies, such as ultrahigh density optical data storage.

Open Access

Publication: Optics Express
Issue/Year: Opt. Express 31, 27868-27879 (2023)
DOI: 10.1364/OE.489095
Link: https://doi.org/10.1364/OE.489095

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