Optical Materials Express
The photophysics of bis(terpyridyl)osmium-(porphinato)zinc- bis(terpyridyl)osmium (OsPZnOs), a D-π-A-π-D symmetric supermolecule, were investigated in the femtosecond and nanosecond regimes. The supermolecule exhibits a two-photon absorption (δpeak ~900 GM) in the near IR (900-1300 nm) and optical pumping by two-photon absorption leads to a broad excited state absorption (σpeak ~1.1 × 10−16 cm2) in the same near IR region. Since the excited state has a long lifetime, OsPZnOs exhibits a strong nanosecond nonlinear absorption in this region. That nonlinear absorption is substantially enhanced when OsPZnOs is incorporated into a multimode waveguide. When two-photon pumping is the dominant mechanism, an additional enhancement of up to ~100 × in the nonlinear absorption is observed in a microchannel waveguide. OsPZnOs is a promising material for photonic applications such as optical noise suppression and optical limiting in the near IR.
S.-H. Chi, A. Rosenberg, A. Nayak, T.V. Duncan, M.J. Therien, J.J. Butler, S.R. Montgomery, G. Beadie, R.G.S. Pong, J.S. Shirk, and S.R. Flom, “Near IR nonlinear absorption of an organic supermolecule [Invited],” Optical Materials Express, 1, 1383-1392 (2011). http://dx.doi.org/10.1364/OME.1.001383