26 October 2017 Induced circular dichroism and laser action of hemicyanine dyes coupled to DNA and DNA-complex
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Strong fluorescence enhancement is induced for many organic dye systems by the coupling to DNA or DNA-surfactant complex, prompting the development of thin film laser devices. Since fluorescence characteristics of the dyes are very sensitive to the interaction mode, it is worthwhile to elaborate their optical properties when interacting with DNA and its complexes. In this study, absorption and circular dichroic (CD) spectra were examined for solutions dissolving hemicyanines and DNA or its complex, and the details of laser emission were studied with the complex films prepared by different methods. Absorption spectra for the dyes changed remarkably by the interaction with pure DNA, while DNA-complex caused blue shift in fluorescence emission process. Clear Cotton effect in induced CD spectra in the dye absorption band indicated the direct interaction with pure DNA presumably due to groove binding. Meanwhile, relatively weak CD signal from the dyes mixed with DNA-complex suggested indirect interaction mode between them. Laser oscillation properties depended on the film formation method. Recently-developed ‘immersion’ process provided thin film devices which showed strong laser emission under optical pumping with population grating. Initial output intensity was two orders of magnitude greater than that from conventionally prepared films. Low threshold and long durability of the immersion made devices were obtained in three types of hemicyanine dyes, making them promising for future application.
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Yutaka Kawabe, Yutaka Kawabe, Yuki Suzuki, Yuki Suzuki, Takuya Tanaka, Takuya Tanaka, Kento Okoshi, Kento Okoshi, } "Induced circular dichroism and laser action of hemicyanine dyes coupled to DNA and DNA-complex", Proc. SPIE 10440, Optical Materials and Biomaterials in Security and Defence Systems Technology XIV, 1044006 (26 October 2017); doi: 10.1117/12.2277394; https://doi.org/10.1117/12.2277394

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