Low birefringence polymers are required for higher quality displays and optical lenses. Alternating copolymerization has revealed a nonlinear relationship between photoelastic birefringence and the copolymerization ratio. Zero birefringence polymers could be produced using a combination of monomers that alternate copolymerization, which was not considered to exhibit zero birefringence in random copolymerization. We demonstrated that the new birefringence control method enables control of novel optical properties by simple alternating copolymerization, that could not be achieved by conventional design methods.

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Hikaru Hotta and Yasuhiro Koike, "Novel birefringence control by alternating copolymerization (Conference Presentation)," Proc. SPIE PC12444, Ultra-High-Definition Imaging Systems VI, PC1244405 (Presented at SPIE OPTO: February 01, 2023; Published: 14 March 2023); https://doi.org/10.1117/12.2655992.6321348705112.