Optically induced metal-to-dielectric transition in Epsilon-Near-Zero metamaterials

Kaipurath, R.M., Pietrzyk, M., Caspani, L., Roger, T., Clerici, M. , Rizza, C., Ciattoni, A., De Falco, A. and Faccio, D. (2016) Optically induced metal-to-dielectric transition in Epsilon-Near-Zero metamaterials. Scientific Reports, 6, 27700. (doi:10.1038/srep27700) (PMID:27292270) (PMCID:PMC4904366)

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Abstract

Epsilon-Near-Zero materials exhibit a transition in the real part of the dielectric permittivity from positive to negative value as a function of wavelength. Here we study metal-dielectric layered metamaterials in the homogenised regime (each layer has strongly subwavelength thickness) with zero real part of the permittivity in the near-infrared region. By optically pumping the metamaterial we experimentally show that close to the Epsilon-Near-Zero (ENZ) wavelength the permittivity exhibits a marked transition from metallic (negative permittivity) to dielectric (positive permittivity) as a function of the optical power. Remarkably, this transition is linear as a function of pump power and occurs on time scales of the order of the 100 fs pump pulse that need not be tuned to a specific wavelength. The linearity of the permittivity increase allows us to express the response of the metamaterial in terms of a standard third order optical nonlinearity: this shows a clear inversion of the roles of the real and imaginary parts in crossing the ENZ wavelength, further supporting an optically induced change in the physical behaviour of the metamaterial.

Item Type:Articles
Additional Information:This work was supported by the EPSRC grant EP/ J004200/1. D.F. acknowledges financial support from the European Research Council under the European Union Seventh Framework Programme (FP/2007-2013)/ERC GA 306559 and EPSRC (UK, Grant No. EP/J00443X/1). L.C. and M.C. acknowledge the support from the People Programme (Marie Curie Actions) of the European Union’s FP7 Programme THREEPLE (GA 627478) and KOHERENT (GA 299522). A.C. and C.R. acknowledge support from U.S. Army International Technology Center Atlantic for financial support (Grant No. W911NF-14-1-0315). The authors acknowledge discussions with M. Scalora.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Faccio, Professor Daniele and Clerici, Dr Matteo
Authors: Kaipurath, R.M., Pietrzyk, M., Caspani, L., Roger, T., Clerici, M., Rizza, C., Ciattoni, A., De Falco, A., and Faccio, D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Scientific Reports
Publisher:Nature Publishing Group
ISSN:2045-2322
ISSN (Online):2045-2322
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Scientific Reports 6:27700
Publisher Policy:Reproduced under a Creative Commons License

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