Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	SHG and orientation phenomena in chromophore DR1-containing polymer films
Δημιουργός/Συγγραφέας:	Moencke, D. Mountrichas, G. [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Rodriguez, V.
Εκδότης:	Elsevier Science Bv
Τόπος έκδοσης:	Amsterdam
Ημερομηνία:	2011-04
Γλώσσα:	Αγγλικά
ISSN:	1569-4410
DOI:	10.1016/j.photonics.2010.11.004
Περίληψη:	Corona poling of two different methacrylate-type co-polymers with the chromophore Disperse Red 1 methacrylate (MDR1) results in the orientation of molecular dipoles and gives a nonlinear optical response in the form of second harmonic generation (SHG). The intensity of the SHG signal was used to measure the effectiveness of poling-induced alignments, which depend also on fundamental order phenomena in the co-polymers. The two matrix polymers varied in length and polarity of their side chains, which affect strongly side chain tacticity and chromophore aggregation. In situ SHG measurements during and after poling showed that the relaxation rate in methacrylic acid (MAA) co-polymers could be lowered by heat-induced cross-linking of the polymer chains. Order parameters derived from SHG measurements were found to be greater than 4, even when no changes were recorded in the optical spectra after poling. When changes were observed in the optical spectra, it was found that these were due to a decrease in the molar extinction coefficient for hydroxy-propyl-methacrylate (HPMA) based co-polymers, and solely due to the poling-induced decrease in film thickness in methacrylic acid based co-polymers (MAA).
Όνομα εκδήλωσης:	International Commission of Optics (ICO) Topical Meeting on Emerging Trends and Novel Materials in Photonics
Ημ/νία έναρξης εκδήλωσης :	2009-10-07
Ημ/νία λήξης εκδήλωσης :	2009-10-09
Τόπος εκδήλωσης:	Delphi, GREECE
Τίτλος πηγής δημοσίευσης:	Photonics and Nanostructures - Fundamentals and Applications
Τόμος/Κεφάλαιο:	9
Τεύχος:	2
Σελίδες:	119-124
Θεματική Κατηγορία:	[EL] Επιστήμη (Γενικά)[EN] Science (General) [EL] Τεχνολογία (Γενικά)[EN] Technology (General) [EL] Οπτική. Φώς[EN] Optics. Light
Λέξεις-Κλειδιά:	Corona poling In situ SHG Nonlinear optical effects Polymers Thin films Relaxation Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2010 Elsevier B.V. All rights reserved.
Ηλεκτρονική διεύθυνση περιοδικού (link) :	http://www.sciencedirect.com/science/journal/15694410
Σημειώσεις:	Special Issue SI
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο