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Ambiguous Refractive Index Sensitivity of Fano Resonance on an Array of Gold Nanoparticles

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Abstract

We investigate the optical response to refractive index changes of a Fano resonance occurring in a random array of gold nanoparticles supported on a glass substrate. The Fano resonance results from the interference between localized surface plasmon on a gold nanoparticle and the light reflected at the boundary of the glass substrate. We demonstrate that the sensitivity of the resonance to the refractive index of the surrounding medium is highly dependent on the excitation geometry and can assume either positive or negative values. We furthermore present a theoretical analysis explaining this behavior based on the rigorous coupled wave analysis (RCWA) as well as the island film theory.

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Acknowledgments

This research was supported by Praemium Academiae of the Academy of Sciences of the Czech Republic, the Czech Science Foundation (contract P205/12/G118), and by the Ministry of Education, Youth and Sports (contract LH11102).

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Authors and Affiliations

  1. Institute of Photonics and Electronics, Academy of Science of CR, Prague, Czech Republic

    Barbora Špačková, Petra Lebrušková, Hana Šípová & Jiří Homola

  2. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic

    Pavel Kwiecien & Ivan Richter

Authors
  1. Barbora Špačková
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  2. Petra Lebrušková
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  3. Hana Šípová
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  4. Pavel Kwiecien
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  5. Ivan Richter
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  6. Jiří Homola
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Correspondence to Jiří Homola.

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Špačková, B., Lebrušková, P., Šípová, H. et al. Ambiguous Refractive Index Sensitivity of Fano Resonance on an Array of Gold Nanoparticles. Plasmonics 9, 729–735 (2014). https://doi.org/10.1007/s11468-013-9641-8

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  • DOI: https://doi.org/10.1007/s11468-013-9641-8

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