2018
DOI: 10.1002/adfm.201805249
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Pump–Push–Probe for Ultrafast All‐Optical Switching: The Case of a Nanographene Molecule

Abstract: In the last two decades, the three-beams pump-push-probe (PPP) technique has become a wellestablished tool for investigating the multidimensional configurational space of a molecule, as it permits to disclose precious information about the multiple and often complex deactivation pathways of the excited molecule. From the spectroscopic point of view, such a tool has revealed details about the efficiency of charge pairs generation and conformational relaxation in p-conjugated molecules and macromolecules. In add… Show more

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Cited by 42 publications
(38 citation statements)
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“…Ultrafast TA spectroscopy has proven to be an ideal tool to investigate the ability of nanographene molecules to establish pronounced intermolecular interactions. 4345 Here, an ultrashort pump pulse (530 nm) allows one to populate the excited states, while a time-delayed broadband probe pulse (450–750 nm) interrogates both the differential transmission (Δ T / T ) spectra and the dynamics of those states on the femtosecond–picosecond time scale. The Δ T / T spectrum of double helicene 2 in a 0.1 mg/mL THF solution (Figure 4a) consists of a positive peak at 450 nm due to pump-induced ground-state depletion (photobleaching, PB) and a broad negative feature linked to excited-state absorption (ESA).…”
Section: Resultsmentioning
confidence: 99%
“…Ultrafast TA spectroscopy has proven to be an ideal tool to investigate the ability of nanographene molecules to establish pronounced intermolecular interactions. 4345 Here, an ultrashort pump pulse (530 nm) allows one to populate the excited states, while a time-delayed broadband probe pulse (450–750 nm) interrogates both the differential transmission (Δ T / T ) spectra and the dynamics of those states on the femtosecond–picosecond time scale. The Δ T / T spectrum of double helicene 2 in a 0.1 mg/mL THF solution (Figure 4a) consists of a positive peak at 450 nm due to pump-induced ground-state depletion (photobleaching, PB) and a broad negative feature linked to excited-state absorption (ESA).…”
Section: Resultsmentioning
confidence: 99%
“…For such purpose, the existing experience in the field of organic lasers might be useful 9,35,36,51,52 . Photophysical studies by means of transient absorption and pump-probe experiments 10,11 , would aid to get insights on the gain and photodegradation mechanisms in these compounds.…”
Section: Discussionmentioning
confidence: 99%
“…Among the several applications of luminescence, such as in sensing, imaging or electroluminescence, lasing has been less developed in organic materials, possibly because of their intrinsic fragility and rapid deterioration under intense optical pumping 9 . In the field of graphene inspired molecular materials, the possibility to obtain stimulated emission through the observation of amplified spontaneous emission (ASE) has been reported only very recently 10,11 . However, applications in real laser devices have not been realized yet.…”
Section: Introductionmentioning
confidence: 99%
“…To this purpose, the organic chemistry bottom–up approach has been applied to NG production with greater success than previously used top–down techniques, which lack control on the final product. With this step forward, amplified spontaneous emission (ASE) was reported for the first time in polystyrene (PS) films doped with an NG derivative [ 14 , 15 ], together with its all-optical switching demonstration [ 16 ]. Subsequently, ASE was reported in a series of three NGs of increasing size (FZ n , with n = 1, 2, 3), which were profited to implement, for the first time, NG-based distributed feedback (DFB) lasers [ 12 ].…”
Section: Introductionmentioning
confidence: 99%