Optical materials: Studying the role of hetropolyacid to enhance the nonlinear optical responses of porphyrin in their hybrids system
| Autor: | Sadaf ul Hassan, Attia Firdous, Zia Ul Haq Khan, Muhammad Asim Farid, Faisal Nawaz, Muhammad Shahid Nazir |
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| Rok vydání: | 2018 |
| Předmět: |
endocrine system
Materials science Hyperpolarizability Electron donor 02 engineering and technology Electron Type (model theory) 010402 general chemistry 01 natural sciences Inorganic Chemistry chemistry.chemical_compound Moiety Electrical and Electronic Engineering Physical and Theoretical Chemistry HOMO/LUMO Spectroscopy chemistry.chemical_classification Organic Chemistry Electron acceptor 021001 nanoscience & nanotechnology Porphyrin Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Crystallography chemistry 0210 nano-technology |
| Zdroj: | Optical Materials. 86:106-112 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2018.09.036 |
| Popis: | Nonlinear optical responses are measured to investigate the role of hetropolyacid (HPA) in porphyrin-Lindqvist type {∼PM@HPA} hybrid systems, {where PM@HPA = [(TBA)8{(MTPPN4)(Mo6O18)4}]; M = 2H (1) and Mn (2)}. The well-known Z-scan technique with wavelength (λ) = 532 nm and pulse duration of τ = 6 ns is used. The results clearly show the significant enhancement in nonlinear self-defocusing effect and reverse saturable absorption under closed and open-aperture configuration for PM@HPA hybrids. It is also observed that the second hyperpolarizability γ values, {1 (4.639 × 10−29 esu) 2 (1.862 eV)} in the PM@HPA hybrid system where the porphyrin moiety acts as electron donor whilst HPA acts as electron acceptor. Therefore, the emergence of a facile electron transformation from the porphyrin moieties to the low-lying LUMO levels of HPA is mainly responsible for the enhancement in nonlinear optical responses of PM@HPA hybrids system. As a consequence the hybrid compounds can be fascinating for optical limiting applications. |
| Databáze: | OpenAIRE |
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