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Extraordinarily transparent compact metallic metamaterials

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Title: Extraordinarily transparent compact metallic metamaterials
Authors: Palmer, S
Xiao, X
Pazos-Perez, N
Guerrini, L
Correa-Duarte, M
Maier, S
Craster, R
Alvarez-Puebla, R
Giannini, V
Item Type: Journal Article
Abstract: The design of achromatic optical components requires materials with high transparency and low dispersion. We show that although metals are highly opaque, densely packed arrays of metallic nanoparticles can be more transparent to infrared radiation than dielectrics such as germanium, even when the arrays are over 75% metal by volume. Such arrays form effective dielectrics that are virtually dispersion-free over ultra-broadband ranges of wavelengths from microns up to millimeters or more. Furthermore, the local refractive indices may be tuned by altering the size, shape, and spacing of the nanoparticles, allowing the design of gradient-index lenses that guide and focus light on the microscale. The electric field is also strongly concentrated in the gaps between the metallic nanoparticles, and the simultaneous focusing and squeezing of the electric field produces strong ‘doubly-enhanced’ hotspots which could boost measurements made using infrared spectroscopy and other non-linear processes over a broad range of frequencies.
Issue Date: 9-May-2019
Date of Acceptance: 29-Mar-2019
URI: http://hdl.handle.net/10044/1/69859
DOI: https://dx.doi.org/10.1038/s41467-019-09939-8
ISSN: 2041-1723
Publisher: Nature Research (part of Springer Nature)
Journal / Book Title: Nature Communications
Volume: 10
Copyright Statement: © 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/.
Sponsor/Funder: Engineering and Physical Sciences Research Council
Engineering & Physical Science Research Council (EPSRC)
The Leverhulme Trust
Funder's Grant Number: EP/L015579/1
EP/L024926/1
RF-2017-017/9
Keywords: physics.optics
MD Multidisciplinary
Publication Status: Published
Article Number: ARTN 2118
Appears in Collections:Condensed Matter Theory
Physics
Mathematics
Experimental Solid State
Applied Mathematics and Mathematical Physics



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