Diffraction-free optical beams propagate freely without change in shape and scale.
Monochromatic beams that avoid diffractive spreading require two-dimensional transverse …

Since the development of laser light sources in the early 1960s, laser beams are
everywhere. Laser beams are central in many industrial applications and are essential in …

Introducing correlations between the spatial and temporal degrees of freedom of a pulsed
optical beam (or wave packet) can profoundly alter its propagation in free space. Indeed …

Spatiotemporal optical wavepackets refer to light fields with sophisticated structures in both
space and time. The ability to produce such spatiotemporally structured optical wavepackets …

Diffraction places a fundamental limitation on the distance an optical beam propagates
before its size increases and spatial details blur. We show here that imposing a judicious …

A surprisingly large number of known distinct sets of light patterns propagate in free space
essentially unchanged. These sets of light patterns (intensity distributions of the electric …

Space-time wave packets are a class of pulsed optical beams that are diffraction-free and
dispersion-free in free space by virtue of introducing a tight correlation between the spatial …

We investigate discrete nondiffracting beams (DNBs) being the foundation of periodic and
quasiperiodic intensity distributions. Besides the number of interfering plane waves, the …

Space-time (ST) wave packets are pulsed beams in which the spatial frequencies and
wavelengths are tightly correlated. Proper design of the functional form of these correlations …

Negative propagation is an uncommon response produced by the local sign change in
Poynting vector components. We present a general Poynting vector expression for all …