Optical Limiting With Neutral Nickel Dithiolene Complexes

摘要

We report an investigation of optical-limiting behavior in 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) in benzene solution. The fluence-dependent transmission of the complexes was observed with nanosecond and picosecond laser pulses at 532-nm wavelength. The limiting thresholds of the complexes were approx 0.3 J/cm~2, when measured with the picosecond pulses. Both picosecond time-resolved pump-probe and Z-scan measuremetn revealed that the limiting effects should originate from excited-state absorption and refraction. The transparency window (400-900 nm), observed in the linear absorption spectra of the complexes, indicated that their limiting response should cover a wider range than those of fullerenes and phthalocyanines.