Complete control of spatially propagating waves (PWs) and surface waves (SWs) is an ultimate goal that scientists and engineers seek for, in which negative reflection of PW and negative surface wave ...

A wave propagating through an inhomogeneous medium is usually partially reflected, which is often undesirable from a practical point of view. Although the reflection from a sharp interface can be ...

This is the week of Ash Wednesday, a solemn day of fasting and reflection that signals the start of Lent, the most penitential season of the church calendar for Catholics and many other Christians. On ...