[21a-PA1-1~15] 3.2 Equipment optics and materials

△ [21a-PA1-14] Photoreversible Modulation of Birefringence of Diarylethene Single Crystals

〇(M1)Kohei Morimoto¹, Hajime Tsujioka¹, Daichi Kitagawa¹, Seiya Kobatake¹ (1.Osaka City Univ.)

Keywords:Diarylethene, Photochromism, Birefringence

We found the photoinduced birefringence change of diarylethene single crystals. The transmittance spectra of the crystals under crossed Nicols exhibited interference due to birefringence. When the crystal was irradiated with ultraviolet light, the interference color was changed, and the transmittance spectrum was shifted. The results indicate that the birefringence was changed by the photoisomerization reaction. Reversible birefringence change upon alternating irradiation with ultraviolet and visible light could be observed. The change in birefringence values of the crystal was obtained by fitting the theoretical formula to the transmittance spectrum.