title: Flexible alteration of optical nonlinearities of iodine charge-transfer complexes in solutions.
abstract: The type of donor used is found to influence greatly the optical nonlinearities of iodine charge-transfer (CT) complexes in solutions for several solvents. The magnitude and sign changes of nonlinear absorption of iodine CT complexes for different solvents as donors are observed, which implies the transition from saturable absorption to reverse saturable absorption. Compared with C60 in toluene, iodine CT complexes with toluene and benzene demonstrate larger reverse saturable absorption. Meanwhile, flexible alteration of optical nonlinearities is easily obtained by adjusting the mixture ratio of different solvents, yielding a prospective means of constructing a nonlinear medium with a large nonlinear coefficient.
authors.affiliation: Photonics Center, College of Physics, Nankai University, Tianjin 300071, China.
authors.forename: Zhi-Bo
authors.initials: ZB
authors.lastname: Liu
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Tian
authors.forename: Wei-Ping
authors.initials: WP
authors.lastname: Zang
authors.forename: Wen-Yuan
authors.initials: WY
authors.lastname: Zhou
authors.forename: Feng
authors.initials: F
authors.lastname: Song
authors.forename: Chun-Ping
authors.initials: CP
authors.lastname: Zhang
authors.forename: Jian-Yu
authors.initials: JY
authors.lastname: Zheng
authors.forename: Hua
authors.initials: H
authors.lastname: Xu