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Proceedings Paper

Chirality in molecular films at the air-water interface
Author(s): Emmanuel Benichou; Gaëlle Gassin-Martin; Arnaud Derouet; Isabelle Russier-Antoine; Guillaume Bachelier; Christian Jonin; Noëlle Lascoux; Minghua Liu; Pierre-François Brevet
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Paper Abstract

Second Harmonic Generation was used to study the optical properties of molecular films formed at the air-water interface. The technique was first applied to a two-dimensional film of 4-(4-dihexadecylaminostyryl)-N-methylpyridinium iodide (DiA) formed at the air-water interface in a Langmuir trough. The SHG intensity was measured as a function of the incident fundamental and outgoing harmonic wave polarization angles at different states of the monolayer compression. The film revealed chirality arising from the formation of molecular aggregates and it was demonstrated that this chirality property arose from the coupling of the electric and magnetic fields at the fundamental frequency. In a second stage, we applied the SHG technique to follow the emergence of chirality during the compression of a molecular film of the amphiphilic compound 5-(octadecyloxy)-2-(2-thiazolylazo) phenol (TARC18). A similar behavior was observed and it was shown that the same origin was responsible for the appearance of chirality. Polarization resolved intensity measurements demonstrated that the magnetic dipole contribution was the dominant one.

Paper Details

Date Published: 21 February 2011
PDF: 8 pages
Proc. SPIE 7935, Organic Photonic Materials and Devices XIII, 79350V (21 February 2011); doi: 10.1117/12.874864
Show Author Affiliations
Emmanuel Benichou, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Gaëlle Gassin-Martin, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Arnaud Derouet, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Isabelle Russier-Antoine, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Guillaume Bachelier, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Christian Jonin, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Noëlle Lascoux, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)
Minghua Liu, Beijing National Lab. for Molecular Sciences (China)
Pierre-François Brevet, Lab. de SpectrométrieIonique et Moléculaire, CNRS, Univ. Claude Bernard Lyon 1 (France)


Published in SPIE Proceedings Vol. 7935:
Organic Photonic Materials and Devices XIII
Robert L. Nelson; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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