[20a-P01-1~21] 3.7 Optical measurement, instrumentation, and sensor

[20a-P01-1] Development of generalized-high accuracy universal polarimeter capable of
low-temperature cooling and its application to Bi₂Sr₂CaCu₂O_8+δ single crystals

〇Komei Okano¹, Kun Zhang¹, Keigo Tokita¹, Kenta Nakagawa², Takuya Nakanishi², Masaki Fujita³, Toru Asahi^1,2 (1.Faculty of Adv. Sci & Eng., Waseda Univ., 2.Comprehensive Research Organization, Waseda Univ., 3.Institute for Materials Research, Tohoku Univ.)

Keywords:

superconductor,optical activity,birefringence

Optical activity (OA) and circular dichroism (CD) in crystals are 10^-2 to 10^-5 times smaller than optical anisotropy and difficult to measure. We have developed a Generalized-High Accuracy Universal Polarimeter (G-HAUP) that enables the simultaneous measurement of OA and CD in anisotropic media. In this study, we modified the G-HAUP to enable low-temperature cooling, and measured OA and CD of Bi2212 using the G-HAUP to investigate the existence of spatial inversion symmetry and time reversal symmetry.