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Metal-dielectric optical resonance in metasurfaces and SERS effect

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Abstract

Anomalous optical response of the metasurface, fabricated from regular silicon resonators is investigated. The resonators have form of two-dimensional regular bars that are covered by nano-thin silver film. Computer simulations as well as real experiment demonstrate deep minima in the reflectance in the optical spectral range. We believe the resonances are due to the excitation of propagating and localized surface em waves. The multiple metal-dielectric resonances result in much enhanced local electromagnetic fields on the surface of the resonators. To investigate the surface enhanced Raman scattering (SERS) effect the metasurface is covered by molecules of 4-mercapto-phenylboronic acid that form covalent bonds with the silver layer. We obtain over \(10^5\) enhancement of the Raman scattering, by direct matching Raman signals from the metasurface and the flat silver surface. The designed metasurface is used as an effective SERS substrate.

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Acknowledgements

We thank group of Dr. Ilya Rodionov from Bauman Moscow State Technical University for assisting in fabrication of experimental samples. This work was supported by the Russian Foundation for Basic Research (Grant Nos. 17-08-01448 and 18-58-00048), Russian Science Foundation (Grant No. 16-14-00209), the Presidium of RAS (Program 22 “Perspective physical and chemical special purpose technologies”).

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Correspondence to A. V. Ivanov.

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This article is part of the Topical Collection on Fundamentals of Laser Assisted Micro- & Nanotechnologies.

Guest edited by Tigran Vartanyan, Vadim Veiko, Andrey Belikov and Eugene Avrutin.

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Sarychev, A.K., Bykov, I.V., Boginskaya, I.A. et al. Metal-dielectric optical resonance in metasurfaces and SERS effect. Opt Quant Electron 52, 26 (2020). https://doi.org/10.1007/s11082-019-2141-0

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  • DOI: https://doi.org/10.1007/s11082-019-2141-0

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