Open AccessEnhanced nonlinear optical responses in donor-acceptor ionic complexes via photo induced energy transfer
Author(s) -
Venkatesh Mamidala,
Lakshminarayana Polavarapu,
Janardhan Balapanuru,
Kian Ping Loh,
QingHua Xu,
Wei Ji
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.025928
Subject(s) - acceptor , materials science , photochemistry , ionic bonding , ultrafast laser spectroscopy , porphyrin , absorption (acoustics) , nonlinear optics , molecular physics , optics , chemical physics , chemistry , laser , ion , physics , organic chemistry , composite material , condensed matter physics
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.