Metamaterials, artificial electromagnetic media that are structured on the subwavelength
scale, were initially suggested for the negative-index'superlens'. Later metamaterials …

This Colloquium presents an overview of the research on nonlinear electromagnetic
metamaterials. The developed theoretical approaches and experimental designs are …

Non-reciprocal components, which are essential to many modern communication systems,
are almost exclusively based on magneto-optical materials, severely limiting their …

Acoustic isolation and nonreciprocal sound transmission are highly desirable in many
practical scenarios. They may be realized with nonlinear or magneto-acoustic effects, but …

This tutorial provides an intuitive and concrete description of the phenomena of
electromagnetic nonreciprocity that will be useful for readers with engineering or physics …

Linear acoustic metamaterials (LAMs) are widely used to manipulate sound; however, it is
challenging to obtain bandgaps with a generalized width (ratio of the bandgap width to its …

Breaking time-reversal symmetry enables the realization of non-reciprocal devices, such as
isolators and circulators, of fundamental importance in microwave and photonic …

Isolators are devices that transmit waves only in one direction, and are widely used to
protect sensitive equipment from reflections and interference. These devices inherently …

The field of metamaterials has opened landscapes of possibilities in basic science, and a
paradigm shift in the way we think about and design emergent material properties. In many …

Optical diodes controlling the flow of light are of principal significance for optical information
processing. They transmit light from an input to an output, but not in the reverse direction …