Reuben M. Bakker

TL;DR: It is shown that 44-nm-diameter nanoparticles with a gold core and dye-doped silica shell allow us to completely overcome the loss of localized surface plasmons by gain and realize a spaser, and that outcoupling of surface plasmon oscillations to photonic modes at a wavelength of 531 nm makes this system the smallest nanolaser reported to date—and to the authors' knowledge the first operating at visible wavelengths.

TL;DR: It is demonstrated experimentally that dielectric nanoparticles can exhibit a radiationless anapole mode in visible, and the spectral overlap of the toroidal and electric dipole modes is achieved through a geometry tuning.

TL;DR: For the first time, hotspots of the magnetic field at visible wavelengths for light polarized across the nanodimer's primary axis are observed using near-field scanning optical microscopy.

TL;DR: In this paper, the authors demonstrate directional lasing, with a low threshold and high quality factor, in active dielectric nanoantenna arrays achieved through a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars.

TL;DR: This work, based on diffractive elements that can efficiently bend light at angles as large as 82°, represents a step beyond traditional optical elements and existing flat optics, circumventing the efficiency drop associated with the standard, phase mapping approach.