Influence of spatial dispersion in metals on the optical response of deeply subwavelength slit arrays

Mathieu Dechaux, Paul-Henri Tichit, Cristian Ciracì, Jessica Benedicto, Rémi Pollès, Emmanuel Centeno, David R. Smith, and Antoine Moreau
Phys. Rev. B 93, 045413 – Published 13 January 2016

Abstract

In the framework of the hydrodynamic model describing the response of electrons in a metal, we show that arrays of very narrow and shallow metallic slits have an optical response that is influenced by the spatial dispersion in metals arising from the repulsive interaction between electrons. As a simple Fabry-Perot model is not accurate enough to describe the structure's behavior, we propose considering the slits as generalized cavities with two modes, one being propagative and the other evanescent. This very general model allows us to conclude that the impact of spatial dispersion on the propagative mode is the key factor explaining why the whole structure is sensitive to spatial dispersion. As the fabrication of such structures with relatively large gaps compared to previous experiments is within our reach, this work paves the way for future much needed experiments on nonlocality.

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  • Received 23 January 2015
  • Revised 15 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.045413

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mathieu Dechaux1,2, Paul-Henri Tichit1,2, Cristian Ciracì3, Jessica Benedicto1,2, Rémi Pollès1,2, Emmanuel Centeno1,2, David R. Smith4, and Antoine Moreau1,2,4

  • 1Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France
  • 2CNRS, UMR 6602, IP, F-63171 Aubière, France
  • 3Instituto Italiano di Tecnologia (IIT), Center for Biomolecular Nanotechnologies, Via Barsanti, I-73010 Arnesano, Italy
  • 4Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, USA

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Issue

Vol. 93, Iss. 4 — 15 January 2016

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