Search

Metasurfaces are a promising platform to exceed their traditional counterparts not only in compactness but also for functionality. However, current designs are limited when trying to implement multiple, non-paraxial functions with a single metasurface as they are bound to either a small angular range or to low efficiencies. Here, we present a new non-local metasurface design that enables the implementation of multiple, independent functions with a large difference in deflection angle. We further demonstrate the capabilities of this approach for advanced control of light emission systems by creating a wavelength-tunable external cavity laser with holographic output based on such metasurface.

Recent work on beams with light structured along the propagation direction will be presented, where the polarization and the OAM of the beam changed along the propagation direction.

We demonstrate an electrically tunable metasurface from an array of nanoresonators coated by a single layer of electro-optic molecules that are embedded in a polymer matrix. By periodic poling of the non-linear coating in plane, we tune the resonant frequency of the array under an applied bias at high speeds and over a broad range in the near-infrared.

It is a well-established truth that spatial hole burning (SHB) in a standing-wave cavity is an essential single-mode instability mechanism for multimode operation of quantum cascade lasers (QCLs). We discovered recently that another instability mechanism–phase turbulence–is capable of triggering an onset of previously unseen types of frequency combs in traveling-wave ring cavity QCLs in absence of SHB. This new regime of laser operation reveals a connection with Kerr combs and paves the way to manipulation and engineering of comb states in QCLs.