Recent developments in non-Hermitian physics offer exciting opportunities for a broad range
of basic research and engineering applications relevant to the antennas and propagation …

We present a general theory of exceptional points of degeneracy (EPD) in periodically time-
variant systems. We show that even a single resonator with a time-periodic component is …

We propose a scheme to obtain highly sensitive oscillators in a coupled-resonator system
with an exceptional point of degeneracy (EPD) and a small instability. The oscillator with the …

Photonics is crucial for communication and computing, as it involves controlling how light
scatters. Recent breakthroughs like bound states in the continuum (BICs) and parity-time …

We demonstrate theoretically and experimentally that a simple periodic fully planar three-
way microstrip coupled waveguide exhibits a stationary inflection point (SIP). The SIP is a …

The emergence of exceptional point (EP) and its divergent form, so-called divergent EP
(DEP), in parity-time (PT)-symmetric trimer opens a new pathway for making radio frequency …

A high-power-microwave (HPM) source consisting of a backward wave oscillator (BWO)
based on a metamaterial slow wave structure (MTM SWS) is investigated and tested. The …

The concept of lasers based on the frozen mode regime in active periodic optical
waveguides with a 3rd-order exceptional point of degeneracy (EPD) is advanced. The …

Materials with Berry-curvature dipoles support a non-Hermitian electro-optic effect that is
investigated here for lasing at terahertz frequencies. Such a system is conceived here as a …

We demonstrate how exceptional points of degeneracy (EPDs) are induced in a single
transmission line (TL) directly by applying periodic space–time modulation to the per-unit …