There are three recognized low-loss configurations for waveguide laser resonators in which the waveguide is either closed at each end by a plane mirror (dual case I design) or one of the plane mirrors is replaced by a curved mirror at some distance from the guide exit. Some time ago, a variant of...

We study critical coupling at oblique incidence and show the suppression of both reflection and transmission in a multilayered system having a two-component metal–dielectric composite film as the top layer. Almost total absorption of the incident electromagnetic energy in the composite film is...