In recent years, peculiar physical phenomena enabled by non-Hermitian systems, especially
the parity-time (PT)-symmetric systems, have drawn tremendous research interests …

A leaky-Vivaldi antenna covered with metasurface (LVAM) is proposed in this paper. The
traditional Vivaldi antenna covered with metasurface realizes backward frequency beam …

Parity-time-reciprocal scaling (PTX)-symmetry has been recently proposed to tailor the
resonance linewidth and gain threshold of non-Hermitian systems with new exhilarating …

Many novel wave phenomena have been observed in parity-time (PT)-symmetric optical
waveguides with a balanced gain and loss. These phenomena are highly related to the …

We investigate symmetry-selective surface-mode excitation in a general periodically time-
modulated double-layer system, where the modulation of the two layers has a constant …

Two identical impedance sheets separated by a subwavelength distance form a coupled
waveguide system. If the impedance sheets also employ balanced gain and loss forming a …

We show for the first time the concept of a second-order exceptional point of degeneracy
(EPD) in a leaky wave antenna (LWA) coupled to a passive waveguide. The LWA system is …

Parity-time (PT) reversal symmetry, as a representative example in the field of non-Hermitian
physics, has attracted widespread research interest in the past few years due to its …