Ultra-broad and reversible ENZ tunability in copper-based plasmonic metamaterials

Anastasiia Zaleska; Alexey Krasavin; Anatoly Zayats; Wayne Dickson

doi:10.1117/12.3021423

11 June 2024 Ultra-broad and reversible ENZ tunability in copper-based plasmonic metamaterials

Anastasiia Zaleska, Alexey Krasavin, Anatoly Zayats, Wayne Dickson

Proceedings Volume PC12990, Metamaterials XIV; PC129901A (2024) https://doi.org/10.1117/12.3021423
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Copper presents an alternative plasmonic constituent benefiting from its high natural abundance and low-cost which makes this material very attractive for commercial exploitation. In this work, we present an inexpensive method for the fabrication of copper nanorod-based metamaterial with controllable dimensions and its intrinsic tunable optical properties determined by the geometry of the nanorod array and surrounding media. Copper nanomaterials are often at a disadvantage compared to those produced using noble metals because of their potential for oxidation. Reframing this problem, we developed a procedure for the controllable growth and reduction of copper oxide layers of nanometric thickness via electrochemical oxidation in an alkaline electrolyte at a rate of approximately 0.23 nm/min. The high refractive index sensitivity of these metamaterials enabled the complex electrochemistry of copper to be monitored via in-situ visible light spectroscopy and the subsequent correlation of the optical spectra with the oxidation and reduction processes.

Conference Presentation

Citation Download Citation

Anastasiia Zaleska, Alexey Krasavin, Anatoly Zayats, and Wayne Dickson "Ultra-broad and reversible ENZ tunability in copper-based plasmonic metamaterials", Proc. SPIE PC12990, Metamaterials XIV, PC129901A (11 June 2024); https://doi.org/10.1117/12.3021423

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