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Proceedings Paper

SFG characterization of a cationic ONLO dye in biological thin films
Author(s): Lewis E. Johnson; Michael T. Casford; Delwin L. Elder; Paul B. Davies; Malkiat S. Johal
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Paper 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.

Paper Details

Date Published: 1 October 2013
PDF: 9 pages
Proc. SPIE 8817, Nanobiosystems: Processing, Characterization, and Applications VI, 88170P (1 October 2013); doi: 10.1117/12.2024391
Show Author Affiliations
Lewis E. Johnson, Pomona College (United States)
Univ. of Washington (United States)
Michael T. Casford, Univ. of Cambridge (United Kingdom)
Delwin L. Elder, Univ. of Washington (United States)
Paul B. Davies, Univ. of Cambridge (United Kingdom)
Malkiat S. Johal, Pomona College (United States)


Published in SPIE Proceedings Vol. 8817:
Nanobiosystems: Processing, Characterization, and Applications VI
Norihisa Kobayashi; Fahima Ouchen; Ileana Rau, Editor(s)

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