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15 September 2004 Opal-based photonic crystals as substrates for ultrasensitive molecular spectroscopy
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Deposition of coinage metals on a crystallographic surface of a colloidal crystal is proposed with the aim of fabricating metal surfaces with a regular relief on a scale of 200-300 nm to get strong surface enhanced Raman scattering (SERS). The approach is implemented through thin gold-film deposition on a surface of a crystal consisting of silica globules. Mitoxantrone, a DNA intercalator, malachite green and methylene blue molecules were used to prove high Raman and fluorescence enhancement efficiency of the structures proposed. Distance dependence measurements of the mitox secondary emission intensity show a long-range character of enhancement effects. As compared to other SERS-active substrates, metal-dielectric colloidal crystal structures possess well-defined surface parameters (globule diameter and film thickness), high stability and reproducibility. These advantages are important for systematic analysis of SERS mechanisms in mesoscopic structures and its application in single-molecule detection.
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Olga S. Kulakovich, Natalia D. Strekal, Valiantsin F. Oskirka, Sergey Maskevich, Sergey V. Gaponenko, Mikhail I. Samoilovich, and Andrey V. Gur'yanov "Opal-based photonic crystals as substrates for ultrasensitive molecular spectroscopy", Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004);

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