Resonance Effect in Brunel Harmonic Generation in Thin Film Organic Semiconductors

Medientyp: E-Artikel
Titel: Resonance Effect in Brunel Harmonic Generation in Thin Film Organic Semiconductors
Beteiligte: Li, Weiwei; Saleh, Ahmad; Sharma, Manas; Hünecke, Christian; Sierka, Marek; Neuhaus, Marcel; Hedewig, Lina; Bergues, Boris; Alharbi, Meshaal; ALQahtani, Hadi; Azzeer, Abdallah M.; Gräfe, Stefanie; Kling, Matthias F.; Alharbi, Abdullah F.; Wang, Zilong
Erschienen: Wiley, 2023
Erschienen in: Advanced Optical Materials
Sprache: Englisch
DOI: 10.1002/adom.202203070
ISSN: 2195-1071
Schlagwörter: Atomic and Molecular Physics, and Optics ; Electronic, Optical and Magnetic Materials
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Beschreibung: <jats:title>Abstract</jats:title><jats:p>Nonlinear optical properties of organic semiconductors (OSCs) have been extensively investigated in the perturbative regime, while strong light induced high‐order processes in solid‐state OSCs are less studied. Here, below‐threshold harmonic generation is examined, both experimentally and theoretically, in two solid‐state thin film OSCs, that is, tetraphenylporphyrin and zinc tetraphenylporphyrin. Results show that the π–π* excitations of the porphyrin ring system generate the harmonic emission. The contribution of the Brunel harmonic to the 5th harmonic emission is uncovered, where the resonant 5‐photon transition (<jats:italic>S</jats:italic><jats:sub>0</jats:sub> → <jats:italic>S</jats:italic><jats:sub>2</jats:sub> transition) is found to lead to an early onset of non‐perturbative behavior. A similar resonance effect is expected in Brunel harmonic generation in other organic materials.</jats:p>

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