Light-emitting metasurfaces

Abstract

Photonic metasurfaces, that is, two-dimensional arrangements of designed plasmonic or dielectric resonant scatterers, have been established as a successful concept for controlling light fields at the nanoscale. While the majority of research so far has concentrated on passive metasurfaces, the direct integration of nanoscale emitters into the metasurface architecture offers unique opportunities ranging from fundamental investigations of complex light-matter interactions to the creation of flat sources of tailored light fields. While the integration of emitters in metasurfaces as well as many fundamental effects occurring in such structures were initially studied in the realm of nanoplasmonics, the field has recently gained significant momentum following the development of Mie-resonant dielectric metasurfaces. Because of their low absorption losses, additional possibilities for emitter integration, and compatibility with semiconductor-based light-emitting devices, all-dielectric systems are promising for highly efficient metasurface light sources. Furthermore, a flurry of new emission phenomena are expected based on their multipolar resonant response. This review reports on the state of the art of light-emitting metasurfaces, covering both plasmonic and all-dielectric systems.

Gain-induced scattering anomalies of diffractive metasurfaces

“…Electromagnetic metasurfaces are two-dimensional (2D) arrays of scatterers used to control amplitude, phase, and polarization of reflected, transmitted, and diffracted electromagnetic waves [1][2][3][4]. Recently, extensive research has been devoted to combining metasurfaces with gain media, with the main focus on distributed feedback lasing and diffractive outcoupling in plasmonic and dielectric nanoparticle arrays [5]. These studies largely relate to the notion of combining gain with surface lattice resonances [6], in which Rayleigh anomalies and plasmon particle resonances hybridize [7].…”

Meta-optics for spatial optical analog computing

“…Furthermore, by combination of an arrangement of high quality factor resonant nanoantennas with quantum dots, strong spontaneous emission occurs leading to light-emitting metasurfaces. The judiciously designed array of such metasurfaces can effectively manipulate the radiation pattern that paves the way toward creation of on-chip flat sources with tailored light fields [90][91][92]. The second (or processing) plane which generally accommodates lenses, holograms, or nonlinear elements can also take advantage of best-of-breed alldielectric metasurfaces.…”

Integration of two-dimensional transition metal dichalcogenides with Mie-resonant dielectric nanostructures

“…Apart from wavefront shaping, Mie-resonant dielectric metasurfaces were recently also extensively employed to enhance and tailor various light-matter interaction processes. By concentrating the electromagnetic near-fields inside and near the individual nanoresonators, strong local field enhancements can be obtained in suitably designed metasurfaces, which was shown to allow for enhancing, e.g., nonlinear optical effects [72] or spontaneous emission processes [1,73]. Further tailoring of the geometry provides additional control of the resonance properties.…”