Abstract

Surface relief formation in azo-polymers has been attracting much attention in a myriad of fields, such as rewritable optical data storages [1]. In recent year, several researchers have discovered that an optical vortex with orbital angular momentum (OAM) twists azopolymers to form chiral surface reliefs, reflecting a helical wavefront of the irradiated optical vortex, with the help of spin angular momentum (SAM) associated with circular polarization [2-3]. The petal modes, formed of the coherent superposition of orthogonal LG modes with a topological charge of ±ℓ, themselves have zero OAM, however, temporally rotating petal modes have the potential to provide an effective OAM with the irradiated materials.

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