Optical amplification in DNA-surfactant complexes incorporating hemicyanine dyes with long and short alkyl chains

Yuki Suzuki; Yutaka Kawabe

doi:10.1117/12.2187149

26 August 2015 Optical amplification in DNA-surfactant complexes incorporating hemicyanine dyes with long and short alkyl chains

Yuki Suzuki, Yutaka Kawabe

Author Affiliations +

Proceedings Volume 9557, Nanobiosystems: Processing, Characterization, and Applications VIII; 955709 (2015) https://doi.org/10.1117/12.2187149
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Hemicyanine dyes are promising materials for solid-state tunable dye lasers because of their high activity for light amplification and superior durability under optical pumping when doped in DNA-surfactant complexes. A hemicyanine with a long alkyl chain, 4-[4-(dimethylamino)stylyl]-1-dococylpyridium bromide (DMASDPB or Hemi22) has been incorporated in the complex films prepared with various methods, demonstrating amplified spontaneous emission (ASE), laser oscillation and its wavelength tuning. While these achievements have seemed to confirm the importance of intercalation or groove-binding of the dyes to DNA strand, our recent studies for the hemicyanine and other dyes suggested that the influence from surfactant molecules was more essential than that from DNA structure. Considering that dye-DNA interaction mode may strongly depend on the size and structure of the dye molecules, another hemicyanine, 4-[4-(dimethylamino)stylyl]-1-methylpyridium iodide (DMASMPI or Hemi1) with methyl substituent instead of C22 of Hemi22, was employed as dopant in the complex for comparison. DMASMPI-doped-complex films prepared by the same method also showed ASE under optical pumping with a threshold value nearly identical to that for DMASDPB, suggesting common interaction feature. On the other hand, the dye had high solubility in water and gave fluorescence enhancement when dissolved in aqueous solution with DNA, indicating direct interaction between the dye and DNA double strand.

Conference Presentation

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Yuki Suzuki and Yutaka Kawabe "Optical amplification in DNA-surfactant complexes incorporating hemicyanine dyes with long and short alkyl chains", Proc. SPIE 9557, Nanobiosystems: Processing, Characterization, and Applications VIII, 955709 (26 August 2015); https://doi.org/10.1117/12.2187149

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