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Tuning the Optical Properties of Hyperbolic Metamaterials by Controlling the Volume Fraction of Metallic Nanorods

1
Department of Materials Science, Lomonosov Moscow State University, 119991 Moscow, Russia
2
Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
3
Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
4
Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia
5
All-Russian Research Institute of Automatics n.a. N.L. Dukhov (VNIIA), 127055, 119991 Moscow, Russia
6
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(5), 739; https://doi.org/10.3390/nano9050739
Received: 24 April 2019 / Revised: 7 May 2019 / Accepted: 10 May 2019 / Published: 14 May 2019
(This article belongs to the Special Issue Electrochemical Synthesis of Nanostructures and Their Applications)
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Abstract

Porous films of anodic aluminum oxide are widely used as templates for the electrochemical preparation of functional nanocomposites containing ordered arrays of anisotropic nanostructures. In these structures, the volume fraction of the inclusion phase, which strongly determines the functional properties of the nanocomposite, is equal to the porosity of the initial template. For the range of systems, the most pronounced effects and the best functional properties are expected when the volume fraction of metal is less than 10%, whereas the porosity of anodic aluminum oxide typically exceeds this value. In the present work, the possibility of the application of anodic aluminum oxide for obtaining hyperbolic metamaterials in the form of nanocomposites with the metal volume fraction smaller than the template porosity is demonstrated for the first time. A decrease in the fraction of the pores accessible for electrodeposition is achieved by controlled blocking of the portion of pores during anodization when the template is formed. The effectiveness of the proposed approach has been shown in the example of obtaining nanocomposites containing Au nanorods arrays. The possibility for the control over the position of the resonance absorption band corresponding to the excitation of collective longitudinal oscillations of the electron gas in the nanorods in a wide range of wavelengths by controlled decreasing of the metal volume fraction, is shown. View Full-Text
Keywords: nanocomposite; templated electrodeposition; anodic aluminum oxide; array of nanorods; gold electrodeposition; hyperbolic metamaterial nanocomposite; templated electrodeposition; anodic aluminum oxide; array of nanorods; gold electrodeposition; hyperbolic metamaterial
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Leontiev, A.P.; Volkova, O.Y.; Kolmychek, I.A.; Venets, A.V.; Pomozov, A.R.; Stolyarov, V.S.; Murzina, T.V.; Napolskii, K.S. Tuning the Optical Properties of Hyperbolic Metamaterials by Controlling the Volume Fraction of Metallic Nanorods. Nanomaterials 2019, 9, 739.

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