The newly emerging field of wave front shaping in complex media has recently seen
enormous progress. The driving force behind these advances has been the experimental …

The resolution of conventional optical lens systems is always hampered by the diffraction
limit. Recent developments in artificial metamaterials provide new avenues to build …

Sensing an incoming signal is typically associated with absorbing a portion of its energy,
inherently perturbing the measurement and creating reflections and shadows. Here, in …

An impedance-matched surface has the property that an incident wave generates no
reflection. Here we demonstrate that by using a simple construction, an acoustically …

We introduce here the concept of acoustic parity-time (PT) symmetry and demonstrate the
extraordinary scattering characteristics of the acoustic PT medium. On the basis of exact …

An impedance matched surface is able, in principle, to totally absorb the incident sound and
yield no reflection, and this is desired in many acoustic applications. Here we demonstrate a …

The effective operation of certain electronic, medical, industrial, and testing equipment relies
on high-quality focusing and imaging capability, which also plays a vital role in the field of …

In the time-reversed counterpart to laser emission, incident coherent optical fields are
perfectly absorbed within a resonator that contains a loss medium instead of a gain medium …

For classical waves such as light or sound, diffraction sets a natural limit on how finely the
details of an object can be recorded on its image. Recently, various optical superlenses …

The concept of a metasurface opens new exciting directions to engineer the refraction
properties in both optical and acoustic media. Metasurfaces are typically designed by …