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The anapole is an intriguing example of a nonradiating source useful in the study of electromagnetic properties in complex phenomena. Here, Miroshnichenko et al.demonstrate that a single dielectric nanoparticle can exhibit a radiationless anapole mode at visible wavelengths.

Though bound states in the continuum (BICs) in acoustic systems are attractive for acoustic resonators design, acoustic BICs typically show low Q-factor. Here, the authors report a high performance open acoustic resonator that supports symmetry-protected, Friedrich-Wintgen and mirror symmetry-induced BICs.

The scattering of light by nanoparticles could be useful for photonic nanoantenna or other light manipulation schemes. Here Kuznetsov et al. demonstrate directional light scattering from silicon nanoparticles for visible light.

The authors report a simple strategy to enable ultrahigh-Q guided-mode resonances by introducing a patterned perturbation layer on top of a multilayer-waveguide system. Such high-Q resonances are experimentally demonstrated with measured Q-factors up to 2.4 × 10⁵.

Control of electrical discharge paths would allow several technological applications, but it usually requires air photoionisation with high-peak-power pulsed lasers. Here, instead, the authors exploit the trapping and heating of light-absorbing particles to guide discharge along the desired path.

Though high-index dielectric metasurfaces are attractive due to their nonlinear effects, channelling of 2^nd and 3^rd harmonic generation into a single beam remains a challenge. The authors addressed this using transition-metal-dichalcogenide metasurfaces with tunable nonlinear emission direction.

As an indirect semiconductor, silicon shows notoriously inefficient luminescence. Here, the authors utilize the Mie resonances in silicon nanoparticles to demonstrate visible white-light emission, both from free-standing spheres and particles etched on a silicon-on-insulator substrate.

A rapid and programmable amplitude modulator based on the thermo-optical effect has been demonstrated by integrating transparent microheaters with metasurfaces.

Here, the authors introduce the concept of nanocscale lasers based on a tightly confined anapole mode. Using first-principle calculations they show that the superposition of internal modes can generate radiation-less states that are scattering free, potentially overcoming the limitations of conventional nanolasers.

The behaviour of multi-dimensional excitation dynamics and localization transition is synthesized in one-dimensional lattices formed by planar photonic structures.

Engineering the magnetic and electric dipole resonances in nanostructures offers unique material applications. Kuznetsov et al.show that by tuning the depth and width of a nanometre scale cut in a metallic nanosphere, they can tune the magnetic resonance across the visible spectral range.

Ensuring robustness of bound states in the continuum usually relies on precise control of geometrical symmetries, which are quite susceptible to fabrication imperfections. Here, the authors propose to exploit physical symmetries instead, as a way to achieve robust BICs in disordered systems.

Devices with greater freedom are desired in nanophotonics. Here, the authors demonstrate theoretically and experimentally that the generalized Brewster effect can be observed in an all-dielectric metasurface potentially for any angle, wavelength and polarization, due to electric and magnetic dipole interference.

Understanding the distribution of energy between electric and magnetic channels of a metamaterial remains elusive. Decker et al.study the emission of quantum dots into these channels for a split-ring-resonator metamaterial and differentiate the fundamental behaviour of the two modes.

Non-Hermitian acoustic resonances in open systems provide a versatile platform to manipulate sound–matter interaction. This Review article surveys the fundamental physics of various acoustic resonances and their uses in realizing different acoustic wave-based applications.

Robotic and other devices often demand ever more compact and sophisticated sensors. This Review assesses the opportunities for metasurfaces to provide optical functionality solutions for such applications.

We experimentally demonstrate high-quality infrared imaging ranging from >1000 to 4000 nanometers with Si metasurfaces based on four-wave mixing (FWM) processes, by employing a pump beam at resonant position.

Metasurface-based photonic slide rule enables the simultaneous resolving of unknown photons’ wavelength and polarization state in mid-infrared.