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Title: Far-field imaging with a multi-frequency metalens

A metalens, i.e., a dense array of identical resonators, allows to image an object pattern at subwavelength scale from far field radiation field. Here, we show that the efficiency can be improved when the resonant frequencies of the cell are distributed over a given frequency range. Because in such systems each eigen mode is localized, the subwavelength image is built from a spectral analysis of the radiated field. A simple model based on coupled resonant dipoles is used to find the best frequency distribution. This multifrequency metalens approach is validated using a flat array of split ring resonators. We experimentally demonstrate the subwavelength resolution of such a device at microwave range.
Authors:
; ;  [1]
  1. ESPCI ParisTech, PSL Research University, Institut Langevin, 1 rue Jussieu, F-75005 Paris, France and CNRS, Institut Langevin, 1 rue Jussieu, F-75005 Paris (France)
Publication Date:
OSTI Identifier:
22299929
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIPOLES; DISTRIBUTION; EFFICIENCY; FREQUENCY RANGE; MICROWAVE RADIATION; RESOLUTION; RESONATORS