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4 April 2005 Surface enhanced SHG from macrocycle, catenane and rotaxane thin films: experiments and theory
Imad Arfaoui, Veronika Bermudez, Celine De Nadai, Jukka-Pekka Jalkanen, Francois Kajzar, David Leigh, Monika Lubomska, Sandra M. Mendoza, Jacek Niziol, Petra Rudolf, Francesco Zerbetto
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Proceedings Volume 5724, Organic Photonic Materials and Devices VII; (2005) https://doi.org/10.1117/12.592379
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States
Abstract
Surface enhanced second harmonic generation experiments on supramolecules: macrocycles, catenanes and rotaxanes, monolayers and multilayers deposited by vacuum evaporation on silver layers are reported and described. The measurements show that the molecules are ordered in thin films. The highest order is observed in the case of macrocycles and the lowest in thin films of fumaramide [2] rotaxanes. Also a better ordering is observed in the case of monolayers. The observed second harmonic generation activity is interpreted in terms of electric field induced second harmonic generation. The electric field contributing to SHG signal is created by silver atoms on the surface of silver layers. The measured second order NLO susceptibilities for a fumaramide [2] rotaxane is compared with that obtained by considering only EFISH contribution to SHG intensities. The electric filed on the surface of silver layer is calculated using TINKER molecular mechanics/dynamics software and the Embedded Atom model. An excellent agreement is observed between the calculated and the measured SHG susceptibilities.
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Imad Arfaoui, Veronika Bermudez, Celine De Nadai, Jukka-Pekka Jalkanen, Francois Kajzar, David Leigh, Monika Lubomska, Sandra M. Mendoza, Jacek Niziol, Petra Rudolf, and Francesco Zerbetto "Surface enhanced SHG from macrocycle, catenane and rotaxane thin films: experiments and theory", Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); https://doi.org/10.1117/12.592379
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KEYWORDS
Thin films
Second-harmonic generation
Silver
Molecules
Chemical species
Polarization
Multilayers
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