Strong two-photon absorption at telecommunications wavelengths in nickel bis(dithiolene) complexes

Abstract

The two-photon absorption spectrum of a nickel bis(dithiolene) complex with extended conjugation and π-donor substitution is measured by using Z-scan and pump–probe techniques with femtosecond pulses over the spectral range from 1.20to1.58 μm , which includes much of the telecommunications range. The peak two-photon cross section of over 5000 GM (1 GM=10 −50 cm ⁴ sphoton ⁻¹ molecule ⁻¹ ) occurs at ∼1.24 μm , with significant two-photon absorption (>440 GM) throughout the spectral range examined.