Far-field probing of leaky topological states in all-dielectric metasurfaces

Maxim A. Gorlach, Xiang Ni, Daria A. Smirnova, Dmitry Korobkin, Dmitry Zhirihin, Alexey P. Slobozhanyuk, Pavel A. Belov, Andrea Alù () and Alexander B. Khanikaev ()
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Maxim A. Gorlach: City College of the City University of New York
Xiang Ni: City College of the City University of New York
Daria A. Smirnova: City College of the City University of New York
Dmitry Korobkin: City College of the City University of New York
Dmitry Zhirihin: ITMO University
Alexey P. Slobozhanyuk: ITMO University
Pavel A. Belov: ITMO University
Andrea Alù: City College of the City University of New York
Alexander B. Khanikaev: City College of the City University of New York

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Topological phase transitions in condensed matter systems give rise to exotic states of matter such as topological insulators, superconductors, and superfluids. Photonic topological systems open a whole new realm of research and technological opportunities, exhibiting a number of important distinctions from their condensed matter counterparts. Photonic modes can leak into free space, which makes it possible to probe topological photonic phases by spectroscopic means via Fano resonances. Based on this idea, we develop a technique to retrieve the topological properties of all-dielectric metasurfaces from the measured far-field scattering characteristics. Collected angle-resolved spectra provide the momentum-dependent frequencies and lifetimes of the photonic modes that enable the retrieval of the effective Hamiltonian and extraction of the topological invariant. Our results demonstrate how the topological states of open non-Hermitian systems can be explored via far-field measurements, thus paving a way to the design of metasurfaces with unique scattering characteristics controlled via topological effects.

Date: 2018
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DOI: 10.1038/s41467-018-03330-9

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