Near IR nonlinear absorption of an organic supermolecule [Invited]

作者：Chi San Hui^*; Rosenberg Armand; Nayak Animesh; Duncan Timothy V; Therien Michael J; Butler James J; Montgomery Steven R; Beadie Guy; Pong Richard G S; Shirk James S; Flom Steven R

来源：Optical Materials Express, 2011, 1(7): 1383-1392.

The photophysics of bis(terpyridyl)osmium-(porphinato)zinc-bis(terpyridyl)osmium (OsPZnOs), a D-pi-A-pi-D symmetric supermolecule, were investigated in the femtosecond and nanosecond regimes. The supermolecule exhibits a two-photon absorption (delta(peak) similar to 900 GM) in the near IR (900-1300 nm) and optical pumping by two-photon absorption leads to a broad excited state absorption (sigma(peak) similar to 1.1 x 10(-16) cm(2)) 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 similar to 100 x 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.

• 出版日期2011-11-1