Abstract
Third-order nonlinear optical susceptibilities χ (3) of tetrakis- n-pentoxy-carbonyl (COO-C 5H 11) naphthalocyanines containing central metal atom oxovanadium (VO), copper (Cu), zinc (Zn), palladium (Pd), and nickel (Ni) were measured by the third-harmonic generation (THG) technique. The metal atom substitution influences the third-order nonlinear optical susceptibility but the variation is less dramatic; oxovanadium cation was found to be the most effective. The order of χ (3) (−3ω; ω, ω, ω) at 2.1 μm wavelength was VONc > CuNc > ZnNc > NiNc > PdNc. The χ (3) (−3ω; ω, ω, ω) for VONc is 8.6 × 10 −11 esu, more than an order of magnitude larger than those of CuNc, ZnNc, PdNc, and NiNc compounds. A comparative study of optical and non-linear optical properties of processable metallo-naphthalocyanines is presented.
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