Pronounced photorefractive effect at wavelength over 1000 nm in monolithic organic materials

摘要

Two monolithic organic materials exhibiting high photorefractive (PR) performances' at a wavelength of 1064 nm were prepared and characterized. It was found that thiophene-based molecule T6 demonstrated better PR properties than benzene based molecule B6. A net optical gain of 139.1 cm~(-1) at a low applied field of 43.7 V/μm and a diffraction efficiency of 45.6% at 35.3 V/μm were observed for materials made from T6. Net optical gain at 1300 nm was also observed for T6. The differences in PR behavior between two materials with similar structures were explained based on dipole moment and photoconductivity differences.