Optical-limiting properties of neutral nickel dithiolenes

    Authors

    W. L. Tan; W. Ji; L. J. Zuo; J. F. Bai; X. Z. You; J. H. Lim; S. Yang; D. J. Hagan;E. W. Van Stryland

    Comments

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    Abbreviated Journal Title

    Appl. Phys. B-Lasers Opt.

    Keywords

    REVERSE SATURABLE ABSORPTION; NONLINEAR ABSORPTION; METAL-COMPLEXES; SINGLE-BEAM; C-60; Optics; Physics, Applied

    Abstract

    We report the observation of optical-limiting effects in benzene solutions of two neutral nickel complexes with multi-sulfur 1,2 dithiolene ligands, [Ni(medt)(2)] 1 (medt = 5,6-dihydro-6-methyl-1,4-dithiin-2,3-dithiolate) and [Ni(phdt)(2)] 2 (phdt = 5,6-dihydro-5-phenyl-1,4-dithiin-2,3-dithiolate). The limiting effects were observed with nanosecond and picosecond laser pulses. The limiting thresholds of complexes 1 and 2 were approximate to 0.3J/cm(2), measured with the ps laser pulses at 532 nm. The linear absorption spectra of the two complexes indicated that their limiting response should cover the visible and near-infrared region (up to 900 nm). Both ps time-resolved pump-probe and Z-scan experiments revealed that the limiting effects should originate from excited-state absorption and refraction superconductors [16-20]. To our best knowledge, no investigations have been carried out on the optical-limiting properties of dithiolene complexes. Here we report the observation of optical-limiting effects in two neutral nickel complexes with multi-sulfur dithiolene ligands, [Ni(medt)(2)](medt = 5,6 dihydro-6-methyl-1,4-dithiin-2,3-dithiolate) 1 and [Ni(phdt)(2)] (phdt = 5,6-dihydro-5-phenyl-1,4-dithinn-2,3-dithiolate) 2. The observation has been carried out by ns and ps laser pulses at a wavelength of 532 nm. The mechanisms leading to the observed limiting effects have also been investigated.

    Journal Title

    Applied Physics B-Lasers and Optics

    Volume

    70

    Issue/Number

    6

    Publication Date

    1-1-2000

    Document Type

    Article

    Language

    English

    First Page

    809

    Last Page

    812

    WOS Identifier

    WOS:000087507300013

    ISSN

    0946-2171

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