Pure deoxyribonucleic acid (DNA) is known to be soluble in water only and exhibits poor temperature stability. In
contrary, it is well known that the complex of DNA – with cetyltrimethyl ammonium (CTMA) is soluble in alcohols and
can be processed into very good optical quality thin films by solution casting and spin deposition.
Despite the success of DNA-CTMA, there is still need for new cationic surfactants which would extend the range of
available solvents for DNA complex. We test and present experimental results of influence of new surfactants based on
benzalkonium chloride (BA), and didecyldimethylammonium chloride (DDCA) for applications in all optical switching.
Imad Arfaoui, Veronika Bermudez, Celine De Nadai, Jukka-Pekka Jalkanen, Francois Kajzar, David Leigh, Monika Lubomska, Sandra Mendoza, Jacek Niziol, Petra Rudolf, Francesco Zerbetto
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.
Linear and nonlinear optical properties of thin films of polyvinyl carbazol (PVK) and its derivatives were studied by UV-VIS spectroscopy and by harmonic generation techniques. Refractive index and its dispersion was measured for PVK and functionalized PVK by m-lines technique. PVK is an interesting polymer because of its high glass transition temperature and photoconducting properties. Functionalized with coumarine may be used for LED's applications and shows also interesting second order NLO properties when poled. The poled polymers may be reversibly depoled with UV light. However, such a process, whose kinetics depends on temperature, leads to a decrease of second-order NLO process. The third-order NLO susceptibility X(3)(- 3(omega) ;(omega) ,(omega) ,(omega) ) is about three times larger for modified PVK and comparable to that found in polysilanes with a larger transparency range.
Conference Committee Involvement (4)
Advanced Materials, Biomaterials, and Manufacturing Technologies for Security and Defence
3 September 2023 | Amsterdam, Netherlands
Optical Materials and Biomaterials in Security and Defence Systems Technology XVI
12 September 2019 | Strasbourg, France
Optical Materials and Biomaterials in Security and Defence Systems Technology
10 September 2018 | Berlin, Germany
Optical Materials and Biomaterials in Security and Defence Systems Technology
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