[2PS-231]
Visible-Transparent Photoaddressable Copolymer Films for Interference-Patterned Optical Fourier Volumes
발표자김문근 (고려대학교)
연구책임자방준하 (고려대학교)
Abstract
Visible-transparent photoaddressable copolymers are promising material platforms for optical Fourier volumes (OFVs) in waveguide augmented reality (AR) displays. To address strong 400–500 nm absorption in azobenzene systems, we synthesized copolymer films incorporating an N-benzylideneaniline (NBA)-derived photoresponsive unit via ATRP, maintaining visible transparency while enabling polarization-driven, axis-selective photoisomerization. Optical absorption was evaluated by UV–Vis spectroscopy, and OFVs were patterned using 405 nm polarization interference patterning (PIP). The grating-formation window was mapped versus PNBA content and film thickness using polarized optical microscopy and Bragg diffraction. Optimized films produced distinct volume gratings, and thicker films showed enhanced angular selectivity. The resulting holographic optical elements exhibited diffraction across RGB wavelengths, supporting their potential for transparent-display holographic optics.