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Item type:Publication, Access status: without files , Phonon-polaritonic skyrmions: transition from bubble- to Néel-type(2026-12-01); ; 39 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Metasurfaces for the nanoscale engineering of light–matter coupling(Nature Publishing Group, 2026-10-05); ; ; ; Metasurfaces are planar, ultrathin arrays of subwavelength nanostructures that provide unprecedented control over optical fields. Initially demonstrated for wavefront shaping in beam steering and holography, metasurfaces are now recognized as a versatile platform for engineering light–matter interactions over broad spectral ranges. This Review surveys how the synergy between structured geometries and material excitations enables metasurfaces to act as a common photonic framework for concentrating light into deeply subwavelength volumes, substantially amplifying optical emission, interaction strengths and nonlinear responses, and giving rise to hybrid light–matter states known as polaritons. We first provide a comprehensive overview of relevant resonance mechanisms and coupling regimes before describing the predominant material excitations (plasmonic, excitonic and phononic). For each, we highlight unifying design principles, the resulting diversity of physical phenomena and the fundamental opportunities and limitations posed by metasurface integration. We close by outlining emergent directions and opportunities for the field, including tailored symmetries as well as topological and quantum metasurfaces.Publicationtype: Journal Article23 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Tunable polaritonic topologies generated by non-local photonic modes(Nature Publishing Group, 2026-05-12); ; ; ; Schwab, JulianPhotonic skyrmions are topological textures that exhibit remarkable resilience to environmental perturbations and support deeply subwavelength features, making them promising candidates for high-resolution microscopy, optical computing devices and ultrahigh-density information encoding. However, in contrast to free-space optical skyrmions, all existing approaches to generate polaritonic field skyrmions are limited by a lack of dynamic tunability. In general, without engineering the phase of the incident light, both their lattice site diameter and total topological charges remain fixed after fabrication. These constraints originate from a shared reliance on wavelength-dependent coupling structures or complex excitation conditions. To overcome these limitations, we introduce the concept of dynamically controllable polaritonic topologies generated by non-local photonic modes. Here we leverage quasi-bound states in the continuum resonances in dielectric metasurfaces to launch hyperbolic phonon polaritons in hexagonal boron nitride that interfere to create highly confined photonic skyrmion lattices with diameters down to 271 nm (λ/25). Thanks to the steep dispersion of hexagonal boron nitride, we can change the excitation frequency to achieve control over the size of individual photonic skyrmions within the same physical resonator structure. In addition, our platform is not limited to one type of topology but can generate optical meron lattices and kπ-twist skyrmions through straightforward variations in resonator shape, providing a feasible path towards skyrmion multiplexing and near-arbitrary topologies. The synergistic integration of resonant metasurfaces with polaritonic topologies has potential applications for nanophotonics, such as topological lasing, nonlinear optics and twistronics, as well as for condensed matter physics, such as Chern insulators and topological edge states.Publicationtype: Journal Article40 10