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All-dielectric metasurface for optical focusing

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Author: Pisano, E. · Silvestri, F. · Gerini, G. · Lancellotti, V. · Galdi, V.
Type:article
Date:2015
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source:9th European Conference on Antennas and Propagation, EuCAP 2015, 12-17 April 2015, Lisbon, Portugal
Identifier: 530886
ISBN: 9788890701856
Article number: 7228407
Keywords: Electronics · Dielectric devices · Dielectric resonators · Lenses · Nanophotonics · Absorption loss · Equal strengths · Full transmissions · Incident fields · Metasurfaces · Numerical results · Optical focusing · Visible wavelengths · Resonators · High Tech Systems & Materials · Industrial Innovation · Nano Technology · OPT - Optics · TS - Technical Sciences

Abstract

We propose the design of a dielectric flat lens for visible wavelengths, capable of efficiently focus the incident field at a given distance. Our approach relies on the recently proposed exploitation of high-index dielectric resonators with spectrally overlapping electric and magnetic dipole resonances of equal strength. This allows the design of 'metasurfaces' characterized by a nearly-full transmission and phase coverage of 360°. Our numerical results confirm that this type of lenses is capable to manipulate and efficiently focus light with low absorption losses. Furthermore it is directly integrable into a nanophotonic system, thanks to its low profile compared to traditional lenses.