Metasurfaces are ushering in an era of multifunctional control over optical wavefronts
realized with ultrathin planarized devices. Recent advances have been enabling …

Diffractive optical elements are well known for being not only flat but also lightweight, and
are characterised by low attenuation. In different spectral ranges, they provide better …

Over the last 20 years, thin and lightweight optical elements have become very desirable,
especially for the terahertz (THz) range. Reduction of the volume of optical elements …

In this work we demonstrate a triangular surface lens (axicon) operating at frequencies
between 350 and 450 GHz using parallel-plate-waveguide technology. The proposed …

The possibility for control of tightly focused laser beams excited by the resonator modes of a
THz laser based on a hollow circular dielectric waveguide is studied theoretically and …

Cylindrical vector beams have many practical applications. These include material
processing, electron acceleration, high-resolution metrology, microellipsometry and …

Diffractive spectroscopy has served as one of the most powerful tools in the history of
physics and extends its applications to optics, astronomy, and biology. However, diffractive …