Abstract

Surface relief formation in azo-polymers has been attracting much interest in a myriad of fields, such as rewritable optical data storages [1]. In recent year, it has been discovered that an optical vortex with orbital angular momentum (OAM) assigned by a topological charge ℓ twists the irradiated azopolymer films to fabricate nano/micron-scale single-armed chiral surface reliefs, thereby enabling the development of high capacity optical data storages with a new freedom of chirality [2-4]. However, even using higher-order optical vortices with |ℓ|≥2, all of the fabricated surface reliefs are always single-armed.

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