We present the first demonstration of the 2-dimensional fabrication of surface reliefs with spiral two-, four-, and six-arms, named "galaxy-shaped surface relief," in an azo-polymer film by employing petal-like modes formed of the superposition of positive and negative Laguerre-Gaussian modes. This demonstration provides new physical insights into the interaction of light and matter to develop rewritable optical data storage with ultrahigh data capacity.
We propose a new approach for light induced chiral surface reliefs, in which multiple-armed chiral surface reliefs are formed in an azo-polymer film by the irradiation of the temporally rotating petal beams without Orbital Angular Momentum (OAM). This approach offers new fundamental physical insight of light matter interaction, and it might open the door towards advanced ultrahigh density rewritable optical data storages.
Orbital angular momentum (OAM) of optical vortex can twist azo-polymers to form a micron-scale chiral surface relief, reflecting the helical wavefront of the irradiated optical vortex beam, with the aid of spin angular momentum (SAM). In this work, we present a new approach for light induced chiral surface relief formation, in which chiral surface reliefs of azopolymers with multiple arms are formed by the irradiation of temporally rotating petal beams without OAM, but assisted by the SAM associated with circular polarization. Also, we demonstrate the orientation control of the fabricated multiple-armed chiral surface reliefs in azo-polymers by properly controlling the exposure time.
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