Issue 3, 2019

Tunable index metamaterials made by bottom-up approaches

Abstract

Despite the exciting optical properties metamaterials exhibit, their implementation in technology is being hampered nowadays by the inherent losses of their metal constituents and the expensive and low-throughput procedures used. As an alternative, we present a new design of double fishnet metamaterials that can be easily realized combining two inexpensive and up-scalable techniques: nanosphere lithography and metallic electrodeposition. A monolayer of polystyrene spheres is used as a template for the infiltration of two symmetric gold layers separated by an air gap. The effective refractive index of the metamaterial can be easily tuned by the appropriate choice of the diameter of the spheres and the gap width between the metallic layers, varying its value from positive to negative. The good agreement between optical measurements and finite-difference time-domain simulations confirms the success of our process. Fishnet metamaterials with refractive index going from 1.5 until −1.0 in the near infrared range are demonstrated and the key parameters for these architectures provided.

Graphical abstract: Tunable index metamaterials made by bottom-up approaches

Supplementary files

Article information

Article type
Paper
Submitted
27 Sep 2018
Accepted
04 Dec 2018
First published
05 Dec 2018
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2019,1, 1070-1076

Tunable index metamaterials made by bottom-up approaches

M. Gómez-Castaño, H. Zheng, J. L. García-Pomar, R. Vallée, A. Mihi and S. Ravaine, Nanoscale Adv., 2019, 1, 1070 DOI: 10.1039/C8NA00250A

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