Breakdown of Spin-to-Helicity Locking at the Nanoscale in Topological Photonic Crystal Edge States

Arora, Sonakshi; Bauer, Thomas; Parappurath, Nikhil; Barczyk, René; Verhagen, Ewold; Kuipers, L.

doi:10.1103/physrevlett.128.203903

Cited by 9 publications

(2 citation statements)

References 48 publications

(47 reference statements)

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“…The benefits offered by adiabatic topological interfaces can be demonstrated by revisiting a spin-Hall design of photonic metasurfaces 7 , 28 , 41 , 42 based on the proposal by Wu and Hu 6 . The structure represents a slab of high-index dielectric material patterned into a triangular lattice of hexamers of holes.…”

Section: Resultsmentioning

confidence: 99%

Adiabatic topological photonic interfaces

et al. 2023

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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.

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Section: Resultsmentioning

confidence: 99%

Adiabatic topological photonic interfaces

et al. 2023

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“…The next level of selectivity, which would realize precise selection rules for light-matter interactions, can be achieved by an additional nanopatterning that would align material components with optical fields at the nanoscale (Fig. 2 b, c), e.g., with the hotspots of given helicity in the pseudo-spin Hall type of systems 19 , 20 .…”

Section: Protected Photonic Transportmentioning

confidence: 99%

Topological photonics: robustness and beyond

Khanikaev,

Alù

2024

Nat Commun

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Synthetic optical materials have been recently employed as a powerful platform for the emulation of topological phenomena in wave physics. Topological phases offer exciting opportunities, not only for fundamental physics demonstrations, but also for practical technologies. Yet, their impact has so far been primarily limited to their claimed enhanced robustness. Here, we clarify the role of robustness in topological photonic systems, and we discuss how topological photonics may offer a wider range of important opportunities in science and for practical technologies, discussing emergent and exciting research directions.

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