{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,12]],"date-time":"2026-04-12T01:14:34Z","timestamp":1775956474641,"version":"3.50.1"},"reference-count":25,"publisher":"AIP Publishing","issue":"18","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2014,5,5]]},"abstract":"<jats:p>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-\u03c0-A organic molecules with elevated molecular hyperpolarizabilities even if these molecules tend to crystallize in centrosymmetric structures.<\/jats:p>","DOI":"10.1063\/1.4875908","type":"journal-article","created":{"date-parts":[[2014,5,9]],"date-time":"2014-05-09T00:30:42Z","timestamp":1399595442000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":16,"title":["Intense optical second harmonic generation from centrosymmetric nanocrystalline para-nitroaniline"],"prefix":"10.1063","volume":"104","author":[{"given":"Dmitry V.","family":"Isakov","sequence":"first","affiliation":[{"name":"Center of Physics, University of Minho, 1 Campus de Gualtar, 4710-057 Braga, Portugal"},{"name":"University of Oxford 2 Department of Materials, , Parks Road, Oxford OX1 3PH, United Kingdom"}]},{"given":"Michael S.","family":"Belsley","sequence":"additional","affiliation":[{"name":"Center of Physics, University of Minho, 1 Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Etelvina","family":"de Matos Gomes","sequence":"additional","affiliation":[{"name":"Center of Physics, University of Minho, 1 Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Hugo","family":"Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"Center of Physics, University of Minho, 1 Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Peter","family":"Schellenberg","sequence":"additional","affiliation":[{"name":"Center of Physics, University of Minho, 1 Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Bernardo G.","family":"Almeida","sequence":"additional","affiliation":[{"name":"Center of Physics, University of Minho, 1 Campus de Gualtar, 4710-057 Braga, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2014,5,8]]},"reference":[{"key":"2023061804302650500_c1","volume-title":"Nonlinear Optical Properties of Organic Molecules","year":"1987"},{"key":"2023061804302650500_c2","doi-asserted-by":"publisher","first-page":"5332","DOI":"10.1021\/cr900335q","volume":"110","year":"2010","journal-title":"Chem. 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