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Giant Enhancement of Transmitted Light and Its Localization Due to Elastic Surface Plasmon–Polariton Scattering by a Thin Dielectric Diffraction Grating

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Abstract

The enhancement factor for surface plasmon–polaritons scattering by a thin dielectric grating was measured experimentally. Scattering of a p-polarized wave may be up to 30,000 times stronger than the non-resonant scattering of an s-polarized wave by the same grating. A detailed comparison between the theoretical calculations and experimental measurements was performed. Strong localization of the scattered field near the edges of diffraction grating grooves was found. Such localization is very promising for numerous applications, e.g., biological sensors, optical tweezers for catching particles, or viruses, etc.

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Notes

  1. We have used the implementation of the finite element method provided by the commercial software COMSOL Multiphysics. The discretisation in each sub-domain has been optimized to achieve the convergence. In the gold film and dielectric grating the maximum element size of the mesh is 10 nm, while in substrate and vacuum regions it is 20 nm

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Acknowledgment

The authors are indebted to Prof. A. Otto for his fruitful discussing of our results.

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Correspondence to Valeriy A. Sterligov.

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Sterligov, V.A., Grytsaienko, I.O., Men, Y. et al. Giant Enhancement of Transmitted Light and Its Localization Due to Elastic Surface Plasmon–Polariton Scattering by a Thin Dielectric Diffraction Grating. Plasmonics 9, 219–226 (2014). https://doi.org/10.1007/s11468-013-9615-x

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