Strong near-infrared and ultrafast femtosecond nonlinearities of a covalently-linked triply-fused porphyrin dimer-SWCNT nanohybrid

Functional materials displaying large ultrafast third-order optical nonlinearities across a wide spectral region and broad temporal domain are required for all-optical signal processing. Particularly desirable is nonlinear (NLO) activity at near-infrared (NIR) wavelengths with femtosecond pulses. Herein the first triply-fused porphyrin dimer (TFP)-functionalized single-walled carbon nanotube (SWCNT) nanohybrid was successfully constructed by covalently grafting TFPs onto SWCNT. The results of Z-scan techniques demonstrate that newly obtained TFP-SWCNT found strong NLO performance under both nanosecond irradiation. In regime, an enhancement in limiting (OL) seen 532 nm when compared monomer-functionalized SWCNT Por-SWCNT. Under irradiation, exhibits particularly OL effect giant two-photon absorption (TPA) cross section value (ca. 15,500 GM) 800 pulses mainly stems from intense TPA TFP, sharp contrast to Por-SWCNT which only saturable identical These newly-developed very promising candidate practical applications domains, functionalizing carbon-based chromophores may be useful approach engineering adaptable photonic devices broad-ranging activity.