Abstract
Halogen doping effects on the third-order nonlinear optical properties of bis(dimethylglyoximato)nickel(II), Ni(dmg)2, which has a one-dimensional backbone of metal chains, were examined. Ni(dmg)2 showed 10-12 esu order of the third-order nonlinear susceptibility χ(3) by three-photon resonance at the dz2-pz transition band. Exposing the Ni(dmg)2 film to chlorine or bromine gas induced a red shift of the dz2-pz transition band and considerable enhancement of the optical nonlinearity. In particular, chlorine doping led to two-odd orders of enhancement of the χ(3) values (10-10 esu order). The doping effects are discussed in relation to the electron delocalization in the linear metal chains.
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