We introduce a nanoengineered nonlinear metasurface based optical element that acts as
an emitting Fresnel zone plate of terahertz (THz) waves. We show that the nonlinear zone …

We propose a method for designing diffractive lenses having a fixed-position focus at
several prescribed wavelengths, which we refer to as spectral diffractive lenses (SDLs). The …

A pair of adjacent transmissive diffractive optical elements (DOEs) forms a combined DOE
with tunable optical properties, as, for example, a diffractive lens with an adjustable focal …

Metasurfaces with superior capabilities to tailor wave fronts of light have become one of the
most widely investigated optical elements. Incorporating tunable features into the …

In this study, a configuration of a compact imaging objective based on a reflecting annular
harmonic lens was proposed. Light propagation through the proposed optical system was …

The paper presents results of the experimental investigation of" spectral" diffractive lenses
the same focus position for several given wavelengths. Two spectral diffractive lenses …

We demonstrate a method for creating a three-dimensional (3D) array of focal spots by
combination of a multi-focal diffractive lens and a two-dimensional multi-value phase …

The auto-focusing property of the optical beams plays an important role in contemporary
optics. In this work, we introduce a method of abruptly auto-focusing multi-focus beam …

A method for calculating a" spectral" diffractive lens, which ensures the preservation of the
focal position at several prescribed wavelengths is proposed. The method is based on …

Laser filamentation is a spectacular phenomenon where the self-focusing of the laser pulse
generates ionizing light channels. Many applications of filamentation, such as the laser …