Development of Transparent Optical Fourier Surfaces Using N-Benzylideneaniline-Derived Polymer for Augmented Reality Displays
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Optical Fourier surfaces (OFSs), advanced surface relief gratings, have progressed through various fabrication techniques. While previous research utilizing azobenzene has shown promise, their blue light absorption limits display applications and complicates fabrication. This study presents a novel transparent polymer derived from N-Benzylideneaniline (NBA), synthesized via ATRP, which enables axis-selective photoisomerization and alignment while avoiding visible light absorption. With aniline-based substituents, the optical properties were optimized, characterized by UV-Vis spectrophotometry. Employing polarized interference, sinusoidal OFSs were successfully engraved into NBA-based films, demonstrating exceptional transmittance and diffraction efficiency. Additionally, a simple implementation of diffractive optical elements (DOEs) was achieved, enabling RGB light transmission and diffraction. These results highlight the potential of NBA-based transparent OFSs for advanced augmented reality (AR) display technologies.