Adiabatic topological photonic interfaces

Anton Vakulenko, Svetlana Kiriushechkina, Daria Smirnova, Sriram Guddala, Filipp Komissarenko, Andrea Alù, Monica Allen, Jeffery Allen and Alexander B. Khanikaev ()
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Anton Vakulenko: The City College of New York (USA)
Svetlana Kiriushechkina: The City College of New York (USA)
Daria Smirnova: The Australian National University
Sriram Guddala: The City College of New York (USA)
Filipp Komissarenko: The City College of New York (USA)
Andrea Alù: The City College of New York (USA)
Monica Allen: Munitions Directorate
Jeffery Allen: Munitions Directorate
Alexander B. Khanikaev: The City College of New York (USA)

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Topological phases of matter have been attracting significant attention across diverse fields, from inherently quantum systems to classical photonic and acoustic metamaterials. In photonics, topological phases offer resilience and bring novel opportunities to control light with pseudo-spins. However, topological photonic systems can suffer from limitations, such as breakdown of topological properties due to their symmetry-protected origin and radiative leakage. Here we introduce adiabatic topological photonic interfaces, which help to overcome these issues. We predict and experimentally confirm that topological metasurfaces with slowly varying synthetic gauge fields significantly improve the guiding features of spin-Hall and valley-Hall topological structures commonly used in the design of topological photonic devices. Adiabatic variation in the domain wall profiles leads to the delocalization of topological boundary modes, making them less sensitive to details of the lattice, perceiving the structure as an effectively homogeneous Dirac metasurface. As a result, the modes showcase improved bandgap crossing, longer radiative lifetimes and propagation distances.

Date: 2023
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DOI: 10.1038/s41467-023-40238-5

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