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TitleIntense optical second harmonic generation from centrosymmetric nanocrystalline para-nitroaniline
Author(s)Isakov, Dmitry
Belsley, M.
Gomes, E. Matos
Goncalves, Hugo
Schellenberg, Peter
Almeida, B. G.
Issue date5-May-2014
PublisherAmerican Institute of Physics
JournalApplied Physics Letters
Abstract(s)We demonstrate an approach that uses normally centrosymmetric, but highly polarizable organic molecules of para-nitroaniline (p-NA) as very efficient second harmonic generator (SHG) for near infra-red light. The approach is based on an effective manipulation of the nanocrystalline size and their assembly into a highly orientated mesocrystalline structures. The resulting mesocrystalline form of p-NA consists of multiple nanocrystals with common orientation, providing a set of surfaces with highly aligned molecules forming a head-to-tail polar arrangement. The second harmonic generation efficiency from this arrangement of mesocrystalline nanostructures is comparable to that from the conventional non-centrosymmetric organic crystals. The experimental results indicate that a very strong second-order nonlinear response can be obtained from small D-p-A organic molecules with elevated molecular hyperpolarizabilities even if these molecules tend to crystallize in centrosymmetric structures. (C) 2014 AIP Publishing LLC.
AccessRestricted access (UMinho)
Appears in Collections:CDF - FAMO - Artigos/Papers (with refereeing)

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