title: Nonlinear absorption and nonlinear refraction of self-assembled porphyrins.
abstract: Nonlinear refraction and nonlinear absorption of self-assembled porphyrins in the nanosecond and picosecond regimes were studied at 532 nm by the Z-scan technique. First, a marked difference in nonlinear refraction was observed between self-assembled zinc porphyrins and free base porphyrins; however, the effects of self-assembly and metallization on nonlinear absorption are small. Second, an enhancement of nonlinear absorption was observed for the monomeric components of self-assembled structures by adding pyridine, while their nonlinear refractions remained almost unchanged as pyridine was added. It is expected that the metallization and addition of ligand can provide more convenient routes to alter the optical nonlinearities of porphyrins than the modifications of molecular structures of traditional covalent-bond organic materials.
authors.affiliation: The Key Laboratory of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials, Ministry of Education and TEDA Applied Physical School, Nankai University, Tianjin 300457, China.
authors.forename: Zhi-Bo
authors.initials: ZB
authors.lastname: Liu
authors.forename: Yi-Zhou
authors.initials: YZ
authors.lastname: Zhu
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhu
authors.forename: Shu-Qi
authors.initials: SQ
authors.lastname: Chen
authors.forename: Jian-Yu
authors.initials: JY
authors.lastname: Zheng
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Tian
mesh_terms: D007834:Lasers; D008024:Ligands; D008027:Light; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry; D011166:Porphyrins / Q000138:chemical synthesis* / Q000737:chemistry*; D012031:Refractometry; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods; D015032:Zinc / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011166:Porphyrins; D015032:Zinc