Wireless power transfer—the transmission of electromagnetic energy without physical
connectors such as wires or waveguides—typically exploits electromagnetic field control …

The article reviews general properties of time-varying dispersive materials. We first briefly
discuss different dispersion models that have been proposed in the literature, the role of the …

Temporal interfaces introduced by abrupt switching of the constitutive parameters of
unbounded media enable unusual wave phenomena. So far, their explorations have been …

Wave absorption in time-invariant, passive thin films is fundamentally limited by a trade-off
between bandwidth and overall thickness. In this work, we investigate the use of temporal …

The trajectory of technological progress is ultimately guided by constraints at the physical
level. In building a better device or system, we are bound 1) by the properties of the …

Multisection quarter-wave impedance transformers are widely applied in microwave
engineering and optics to attain impedance-matching networks and antireflection coatings …

During the last decade, possibilities to realize new phenomena and create new applications
by varying system properties in time have gained increasing attention in many research …

In this paper, generation of optical vortices with time-varying orbital angular momentum
(OAM) and topological charge is theoretically demonstrated based on time-modulated …

Time-varying systems open intriguing opportunities to explore novel approaches in the
design of efficient electromagnetic devices. While such explorations date back to more than …

Exploring the interaction of light with time‐varying media is an intellectual challenge that, in
addition to fundamental aspects, provides a pathway to multiple promising applications …