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Title: Enhanced nonlinear optical responses in donor-acceptor ionic complexes via photo induced energy transfer
Authors: Mamidala, V.
Polavarapu, L. 
Balapanuru, J.
Loh, K.P. 
Xu, Q.-H. 
Ji, W. 
Issue Date: 6-Dec-2010
Source: Mamidala, V., Polavarapu, L., Balapanuru, J., Loh, K.P., Xu, Q.-H., Ji, W. (2010-12-06). Enhanced nonlinear optical responses in donor-acceptor ionic complexes via photo induced energy transfer. Optics Express 18 (25) : 25928-25935. ScholarBank@NUS Repository.
Abstract: 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. © 2010 Optical Society of Americ.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OE.18.025928
Appears in Collections:Staff Publications

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