The high-order optical nonlinearity of 2,11,20,29-tetrabromo-2,3-naphthalocyanine iron

摘要

A novel naphthalocyanine 2,11,20,29-tetrabromo-2,3-naphthalocyanine iron was synthetized. Its optical nonlinearity was investigated using the Z-scan technique. Reverse saturable absorption and high-order optical nonlinear refraction were detected. The absorption cross sections of the ground state, the singlet first excited state and the triplet first excited state were fitted to be 3.2 × 1018 cm2, 6.2 × 10-18 cm2 and 4.6 × 10-18 cm2, respectively. Fits also gave 1.17 × 10-28 cm3 for the refractive volume of the ground state, 0.6 for the ratio of the refractive volume of the singlet first excited state to the ground state and 2.7 for the ratio of refractive volume of the first triplet excited state to the ground state.