Enhanced nonlinear optical responses in donor-acceptor ionic complexes via photo induced energy transfer
| Autor: | Lakshminarayana Polavarapu, Janardhan Balapanuru, Venkatesh Mamidala, Wei Ji, Kian Ping Loh, Qing-Hua Xu |
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| Rok vydání: | 2010 |
| Předmět: |
Ions
Materials science Light Scattering business.industry Graphene Static Electricity Ionic bonding Acceptor Electron transport chain Porphyrin Atomic and Molecular Physics and Optics Ion law.invention Nanostructures Electron Transport chemistry.chemical_compound Optics chemistry Energy Transfer Nonlinear Dynamics law Ultrafast laser spectroscopy Graphite business |
| Zdroj: | Optics express. 18(25) |
| ISSN: | 1094-4087 |
| Popis: | By complexion of donor and acceptor using ionic interactions, the enhanced nonlinear optical responses of donor-acceptor ionic complexes in aqueous solution were studied with 7-ns laser pulses at 532 nm. The optical limiting performance of negatively charged gold nanoparticles or graphene oxide (Acceptor) was shown to be improved significantly when they were mixed with water-soluble, positively-charged porphyrin (Donor) derivative. In contrast, no enhancement was observed when mixing with negatively-charged porphyrin. Transient absorption studies of the donor-acceptor complexes confirmed that the addition of energy transfer pathway were responsible for excited-state deactivation, which results in the observed enhancement. Fluence, angle-dependent scattering and time correlated single photon counting measurements suggested that the enhanced nonlinear scattering due to faster nonradiative decay should play a major role in the enhanced optical limiting responses. |
| Databáze: | OpenAIRE |
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