Waves entering a spatially uniform lossy medium typically undergo exponential intensity
decay, arising from either the energy loss of the Beer–Lambert–Bouguer transmission law or …

We propose and analyze an efficient scheme for the lopsided Raman-Nath diffraction of one-
dimensional (1 D) and two-dimensional (2 D) atomic gratings with periodic parity-time (PT) …

Optical structures with balanced loss and gain provide an efficient platform to study the
features of light propagation under non-Hermitian parity-time symmetry. Here, we report a …

Cold atoms trapped in one-dimensional optical lattices and driven to the four-level N
configuration are exploited for achieving an electromagnetically induced grating with parity …

The phenomenon of half-spectral unidirectional invisibility is introduced for one-dimensional
periodic optical structures with tailored real and imaginary refractive index distributions in a …

A broad class of planar dielectric media with complex permittivity profiles that are fully
invisible, for both left and right incidence sides, is introduced. Such optical media are locally …

Fraunhofer light diffraction across a thin two-dimensional lattice of cold atoms subject to
transverse hybrid modulations of two standing-wave crossed pump fields is seen to yield …

A flexible control of wave scattering in complex media is of relevance in different areas of
classical and quantum physics. Recently, great interest has been devoted to scattering …

In a seminal work, Horsley and collaborators [SAR Horsley,, Nat. Photon. 9, 436 (2015) 1749-
4885 10.1038/nphoton. 2015.106] showed that, in the framework of non-Hermitian …

Asymmetric reflection in Bragg gratings and asymmetric diffraction in diffraction gratings are
both linked to parity-time (PT) symmetry in non-Hermitian optics, but their direct relation has …