17 August 2014 Observation of optical domino modes in arrays of non-resonant plasmonic nanoantennas
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Domino modes are highly-confined collectivemodes that were first predicted for a periodic arrangement of metallic parallelepipeds in far-infrared region. The main feature of domino modes is the advantageous distribution of the local electric field, which is concentrated between metallic elements (hot spots), while its penetration depth in metal is much smaller than the skin-depth. Therefore, arrays of non-resonant plasmonic nanoantennas exhibiting domino modes can be employed as broadband light trapping coatings for thin-film solar cells. However, until now in the excitation of such modes was demonstrated only in numerical simulations. Here, we for the first time demonstrate experimentally the excitation of optical domino modes in arrays of non-resonant plasmonic nanoantennas. We characterize the nanoantenna arrays produced by means of electron beam lithography both experimentally using an aperture-type near-field scanning optical microscope and numerically. The proof of domino modes concept for plasmonic arrays of nanoantennas in the visible spectral region opens new pathways for development of low-absorptive structures for effective focusing of light at the nanoscale.
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Ivan S. Sinev, Ivan S. Sinev, Anton K. Samusev, Anton K. Samusev, Pavel M. Voroshilov, Pavel M. Voroshilov, Ivan S. Mukhin, Ivan S. Mukhin, Andrey I. Denisyuk, Andrey I. Denisyuk, Mikhail E. Guzhva, Mikhail E. Guzhva, Pavel A. Belov, Pavel A. Belov, Constantin R. Simovski, Constantin R. Simovski, "Observation of optical domino modes in arrays of non-resonant plasmonic nanoantennas", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91632R (17 August 2014); doi: 10.1117/12.2061675; https://doi.org/10.1117/12.2061675

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