Terahertz cavity electrodynamics is an emerging research area, offering exciting new opportunities for research of light-matter interactions. In a new experimental work, researchers leverage electro-optic sampling to directly measure electromagnetic fields inside of a macroscopic planar cavity for the first time.
Unlike conventional cavities, which rely on external substrates that introduce interferences and dispersive effects, the cavities in this work are produced by depositing mirrors directly onto [more...]

Metasurfaces are artificial structures that enable flat optical components and pave the way for on-chip light processing. A promising route to new functionalities is to build metasurfaces out of materials with strong optical resonances. Light then propagates across the metasurface in the form of polaritons – mixed light-matter particles. This recently enabled coherent thermal light sources and directional waveguiding. So far, it has been challenging to characterize metasurfaces because of their small sub-wavelength building blocks, their overall large spatial extent, and their wavelength-dependent [more...]