Crystalline metamaterials for topological properties at subwavelength scales

Simon Yves, Romain Fleury, Thomas Berthelot, Mathias Fink, Fabrice Lemoult and Geoffroy Lerosey ()
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Simon Yves: Institut Langevin, CNRS UMR 7587, ESPCI Paris, PSL Research University
Romain Fleury: Institut Langevin, CNRS UMR 7587, ESPCI Paris, PSL Research University
Thomas Berthelot: NIMBE, CEA, CNRS Université Paris-Saclay, CEA Saclay
Mathias Fink: Institut Langevin, CNRS UMR 7587, ESPCI Paris, PSL Research University
Fabrice Lemoult: Institut Langevin, CNRS UMR 7587, ESPCI Paris, PSL Research University
Geoffroy Lerosey: Institut Langevin, CNRS UMR 7587, ESPCI Paris, PSL Research University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract The exciting discovery of topological condensed matter systems has lately triggered a search for their photonic analogues, motivated by the possibility of robust backscattering-immune light transport. However, topological photonic phases have so far only been observed in photonic crystals and waveguide arrays, which are inherently physically wavelength scaled, hindering their application in compact subwavelength systems. In this letter, we tackle this problem by patterning the deep subwavelength resonant elements of metamaterials onto specific lattices, and create crystalline metamaterials that can develop complex nonlocal properties due to multiple scattering, despite their very subwavelength spatial scale that usually implies to disregard their structure. These spatially dispersive systems can support subwavelength topological phases, as we demonstrate at microwaves by direct field mapping. Our approach gives a straightforward tabletop platform for the study of photonic topological phases, and allows to envision applications benefiting the compactness of metamaterials and the amazing potential of topological insulators.

Date: 2017
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DOI: 10.1038/ncomms16023

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