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Showing 1–10 of 10 results
Advanced filters: Author: Alexander Paarmann Clear advanced filters

  • The authors demonstrate deeply subwavelength light confinement in the terahertz spectral range by exploiting the strong light–matter coupling and hyperbolicity of phonon polaritons in hafnium-based dichalcogenides.

    • Ryan A. Kowalski
    • Niclas S. Mueller
    • Joshua D. Caldwell
    ResearchOpen Access
    Nature Materials
    P: 1-7

  • Hyperbolic phonon polaritons occurring in anisotropic materials exhibit strong light confinement and propagation directionality. Matson et al. report real-space imaging and control of recently discovered hyperbolic shear phonon-polaritons in beta-Ga2O3, arising from symmetry breaking in the dielectric response.

    • Joseph Matson
    • Sören Wasserroth
    • Joshua D. Caldwell
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-8

  • A new form of directional polaritons, leaky in nature and featuring lenticular dispersion contours, is experimentally observed both in near-field and through prism excitation, unveiling opportunities stemming from the interplay of extreme anisotropic responses, light confinement and directional radiation leakage.

    • Xiang Ni
    • Giulia Carini
    • Andrea Alù
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-9

  • The directional propagation of phonon polaritons has been demonstrated in various twisted van der Waals materials. Here, the authors report a complementary type of directional polariton propagation by visualizing unidirectional ray polaritons in twisted asymmetric stacks of α-MoO3 and/or β-Ga2O3.

    • J. Álvarez-Cuervo
    • M. Obst
    • A. Paarmann
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-10

  • Shear phenomena in the infrared dielectric response of a monoclinic crystal are shown to unveil a new polariton class termed hyperbolic shear polariton that can emerge in any low-symmetry monoclinic or triclinic system.

    • Nikolai C. Passler
    • Xiang Ni
    • Alexander Paarmann
    ResearchOpen Access
    Nature
    Volume: 602, P: 595-600

  • The properties of lipid membranes are intimately controlled by their complex heterogeneous structure. Here, the authors use phase-resolved sum-frequency generation microscopy to fully determine the hierarchical lipid packing from the molecular to the mesoscopic scale.

    • Alexander P. Fellows
    • Ben John
    • Martin Thämer
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-10

  • Femtosecond low-energy electron pulses allow probing ultrafast processes in nanoscale systems with high spatial and temporal resolution. Here, the authors develop a hybrid approach for studying ultrafast electric currents and structural dynamics in low-dimensional systems.

    • Melanie Müller
    • Alexander Paarmann
    • Ralph Ernstorfer
    Research
    Nature Communications
    Volume: 5, P: 1-8

  • Broken symmetries at the nanoscale can greatly modify the emergent nanophotonic responses enabled by phonon polaritons. This Review discusses how lowering the degree of symmetry in natural and artificial materials gives rise to a wide spectrum of low-loss, directional, confined light–matter quasiparticles.

    • Emanuele Galiffi
    • Giulia Carini
    • Andrea Alù
    Reviews
    Nature Reviews Materials
    Volume: 9, P: 9-28

  • We design, implement, and model electro-optic cavities (EOCs) to unlock time-domain measurements of intra-cavity fields. Furthermore, we decode avoided crossings in continuously tunable EOCs, enabling switchable light-matter coupling in the future.

    • Michael S. Spencer
    • Joanna M. Urban
    • Sebastian F. Maehrlein
    ResearchOpen Access
    Light: Science & Applications
    Volume: 14, P: 1-14