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Optical Properties of Plasmonic Nanoantennas Based on Arrays of Interacting V-Shaped Structures in the Mid-IR Range

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Abstract

Polarization-selected IR transmission, IR reflection, and IR absorption spectra of arrays of V-shaped gold structures are experimentally studied for various structure periods. To form a local region of the enhanced electromagnetic field in subwavelength nanogaps, arrays with unit cells consisting of two V-shaped structures, facing each other by acute angles with gaps of 0, 50, 100 nm were also used. The results of comparison of spectral data with measurements of dimensional parameters using atomic-force microscopy and scanning electron microscopy are presented. The possibility of using the fabricated structures to achieve the effect of surface-enhanced IR absorption by quantum dots is shown.

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Acknowledgments

The study of spectral properties and the fabrication of structures were supported by the Russian Science Foundation, project no. 17—79—20418. Fine experiments on the AFM and SEM analysis of the morphology of the fabricated structures were supported by the Russian Foundation for Basic Research, projects nos. 18—32—01051 and 17—02—01408, respectively.

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Correspondence to D. A. Chubich.

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Russian Text © The Author(s), 2019, published in Kratkie Soobshcheniya po Fizike, 2019, Vol. 46, No. 11, pp. 20–26.

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Chubich, D.A., Zvagelsky, R.D., Pisarenko, A.V. et al. Optical Properties of Plasmonic Nanoantennas Based on Arrays of Interacting V-Shaped Structures in the Mid-IR Range. Bull. Lebedev Phys. Inst. 46, 344–347 (2019). https://doi.org/10.3103/S1068335619110046

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  • DOI: https://doi.org/10.3103/S1068335619110046

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