摘要
Birefringent optical elements that work in deep ultraviolet(DUV)region become increasingly important these years.However,most of the DUV optical elements have fixed birefringence which is hard to be tuned.Here,we invent a birefringence-tunable optical hydrogel with mechano-birefringence effect in the DUV region,based on two-dimensional(2D)low-cobalt-doped titanate.This 2D oxide material has an optical anisotropy factor of 1.5×10^(-11) C^(2)J^(-1) m-1,larger than maximum value obtained previously,leading to an extremely large specific magneto-optical Cotton-Mouton coefficient of 3.9×10^(6) T^(-2) m-1.The extremely large coefficient enables the fabrication of birefringent hydrogel in a small magnetic field with an ultra-low concentration of 2D oxide material.The hydrogel can stably and continuously modulate 303 nm DUV light with large phase tunability by varying the strain(compression or stretching)from 0 to 50%.Our work opens the door to design and fabricate new proof-of-concept DUV birefringence-tunable element,as demonstrated by optical hydrogels capable of DUV modulation by mechanical stimuli.
基金
support by the National Natural Science Foundation of China(Grants 51920105002,52273311 and 52125309)
the Guangdong Innovative and Entrepreneurial Research Team Program(Grant 2017ZT07C341)
the Shenzhen Basic Research Project(Grants JCYJ20190809180605522,and WDZC20200819095319002)
the National Key R&D Program(Grant 2018YF A0307200)
the National Program on Key Basic Research Project of China(Grant 2020JCJQ-ZD-06312).
