Resonance Effect in Brunel Harmonic Generation in Thin Film Organic Semiconductors

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. und Wang, Zilong (2023): Resonance Effect in Brunel Harmonic Generation in Thin Film Organic Semiconductors. In: Advanced Optical Materials, Bd. 11, Nr. 16

Abstract

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 (S0 → S2 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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2195-1071
• Sprache: Englisch