SFG characterization of a cationic ONLO dye in biological thin films

Lewis E. Johnson; Michael T. Casford; Delwin L. Elder; Paul B. Davies; Malkiat S. Johal

doi:10.1117/12.2024391

1 October 2013 SFG characterization of a cationic ONLO dye in biological thin films

Lewis E. Johnson, Michael T. Casford, Delwin L. Elder, Paul B. Davies, Malkiat S. Johal

Proceedings Volume 8817, Nanobiosystems: Processing, Characterization, and Applications VI; 88170P (2013) https://doi.org/10.1117/12.2024391
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

Biopolymer-based thin films, such as those composed of CTMA-DNA, can be used as a host material for NLOactive dyes for applications such as electro-optic (EO) switching and second harmonic generation. Previous work by Heckman et al. (Proc. SPIE 6401, 640108-2) has demonstrated functioning DNA-based EO modulators. Improved performance requires optimization of both the first hyperpolarizabilities (β) and degree of acentric ordering exhibited by the chromophores. The cationic dye DANPY-1 (Proc. SPIE 8464, 846409-D) has a high affinity for DNA and a substantial hyperpolarizability; however, its macroscopic ordering has not been previously characterized. We have characterized the acentric ordering of the dye using sum-frequency generation (SFG) vibrational spectroscopy in surface-immobilized DNA and on planar metal and dielectric surfaces.

Citation Download Citation

Lewis E. Johnson, Michael T. Casford, Delwin L. Elder, Paul B. Davies, and Malkiat S. Johal "SFG characterization of a cationic ONLO dye in biological thin films", Proc. SPIE 8817, Nanobiosystems: Processing, Characterization, and Applications VI, 88170P (1 October 2013); https://doi.org/10.1117/12.2024391

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