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

Abstract

Strong nonlinear optical absorption under laser irradiation across a wide spectral region and a broad temporal domain.

Enhanced nonlinear optical properties of a π-conjugated porphyrin dimer–graphene nanocomposite

“…With these micro-plasmas and bubbles, the light is strongly scattered and deviated from the original direction of the incident laser beam, resulting in a better OL effect. 38 Among all samples tested, G-1a exhibits the lowest transmittance and the largest NLO coefficient in comparison with its precursors 1a and graphene as well as the reference porphyrin monomer ZnTPP, porphyrin monomer functionalized graphene G-ZnTPP, which can be deduced mainly from the strongly enhanced RSA of 1a (Fig. 4a and b) and the more effective PET/PEnT process from 1a to graphene (confirmed by the absorption and fluorescence results).…”

“…2d) reveals three different peaks at 397.0 eV 398.3, and 400.4 eV, which can be assigned to the nitrogen atoms of CQN, O-Zn-N, and C-N-H, respectively, in metalloporphyrin dimers. [35][36][37][38] Particularly, the emergence of O-Zn-N indicated that a part of the Zn atoms at the center of the porphyin dimer 1a were axially coordinated with the O atoms at the defect sites of graphene, which may give rise to a closer attachment of 1a onto the basal plane of graphene. The sharp peaks at 1044.0 eV and 1021.0 eV (Fig.…”

“…As we know, the efficiency of the RSA behavior (the main NLO mechanism of porphyrin analogues under ns laser conditions) depends on the ratio of the excited-state and ground-state absorption crosssections (s ex /s L ), that is, the larger s ex /s L , the more efficient RSA. 38,47,48 Jablonski diagrams can be used to preliminarily describe the states and decay kinetics of the porphyrins after excitation (Fig. 4d).…”

“…Both nanocomposites G-ZnTPP and G-1a exhibit stronger NLO performances than that of the individual precursors G, ZnTPP, and 1a, which may stem from a synergistic effect of the RSA of 1a/ZnTPP, the nonlinear scattering (NLS) of graphene and the effective PET/PEnT from 1a/ ZnTPP to graphene. 3,22,38 The result of NLS usually results from the thermally formed scattering centers, consisting of ionized carbon micrometer-sized plasmas and solvent microbubbles, which are generated through heating of the carbon-based dispersions under high fluence laser radiation. With these micro-plasmas and bubbles, the light is strongly scattered and deviated from the original direction of the incident laser beam, resulting in a better OL effect.…”

Enhanced non-linear optical properties of porphyrin-based polymers covalently functionalized with graphite phase carbon nitride

“…Although the aggregation was effectively reduced, but the decrease of the content of porphyrin in the polymer was decreased with the increase of the molecular weight (MW) of porphyrin-based polymer correspondingly, which has a negative influence on NLO property. Other studies showed that porphyrins and nanomaterials were prepared into nanohybrids, and the NLO performance of the nanohybrids could be improved because of the PET between porphyrins and nanomaterials ( Wang et al, 2014 ; Wang A. et al, 2020 ; Fu et al, 2022 ). Consequently, the combination of porphyrin-based polymers and nanomaterials might offer a better solution to further increase the NLO performance of porphyrin-based materials ( Wan et al, 2012 ; Liu et al, 2013 ; Garg et al, 2017 ; Liang et al, 2022 ).…”