Off-resonant third-order nonlinear optical properties of multiply-bonded multinuclear organometallic complexes measured with femtosecond pulses

Synthesis and third-order optical nonlinearities of nickel complexes of 8-hydroxyquinoline derivatives

“…Near z = o, the thin lens had little effect on a focus beam and the aperture transmittance returned to its low intensity value. For z > 0, the negative lensing caused the beam divergence to increase, resulting in a decreased aperture transmittance.When the intensity of the signal was dependent on the cubic power of the incident laser beam, the third-order susceptibilities of the sample could be determined by using CS 2 as a reference under identical conditions [30][31][32][33]. The nonlinear refractive index of CS 2 (n 2;CS 2 ) was considered as (3.1 ± 0.2) Â 10 À18 m 2 /W.…”

“…For the absorption ranged in 370-500 nm, it was assigned to a p-p * ligand transition where charge density is transferred from oxygen to nitrogen [27]. Due to the characteristics of charge transfer, the bathchromic shift of this low-energy absorption band was more evident; 6 7.8 Â 10 À2 ----47,710 Ref. [35] k max = 423 nm for Ni(AAMQ) 2 while k max = 415 nm for NiQ 2 .…”

“…In the past two decades, the third-order nonlinear optical (NLO) properties have triggered large scale of theoretical and experimental investigations in many research groups [1][2][3][4][5][6]. In particular, organometallic complexes have attracted significant interests due to their highly improved nonlinearity caused by intense charge transfer between the metal and the ligands, and by the reversibly switched nonlinearity relating to the multiple electronic states of the metal atoms.…”

“…In particular, organometallic complexes have attracted significant interests due to their highly improved nonlinearity caused by intense charge transfer between the metal and the ligands, and by the reversibly switched nonlinearity relating to the multiple electronic states of the metal atoms. Complexes of p-excessive heterocyclic aromatic compounds have always been the subjects of scientific concerns in this field [4][5][6].…”