Terahertz time-domain spectroscopy (THz-TDS) is a powerful technique for material's
characterization and process control. It has been used for contact-free conductivity …

The terahertz range is generally defined as the portion of the electromagnetic spectrum that
lies between 100 GHz and 10 THz. It is situated above the microwave range, and below the …

Recently, growing interest has been attracted to metamaterialsbased novel optical devices.
Metamaterials enable exciting physics and technologically important capabilities ranging …

In this communication, we demonstrate for the first time a freely tunable polarization rotator
for broadband THz waves using a three-rotating-layer metallic grating structure, which can …

We show that a flat metasurface with a parabolic reflection-phase distribution can focus an
impinging plane wave to a point image in reflection geometry. Our system is much thinner …

New applications in the realms of terahertz (THz) technology require versatile adaptive
optics and powerful modulation techniques. Semiconductors have proven to provide fast all …

Electromagnetic metastructures stand for the artificial structures with a characteristic size
smaller than the wavelength, which may efficiently manipulate the states of light. However …

Metamaterials offer exciting opportunities that enable precise control of amplitude,
polarization and phase of the light beam at a subwavelength scale. A gradient metasurface …

Conventional mirrors obey the simple reflection law that a plane wave is reflected as a plane
wave, at the same angle. To engineer spatial distributions of fields reflected from a mirror …

In this paper, an incident angle-and polarization-insensitive metamaterial absorber is
proposed for X-band applications. A unit cell of the proposed absorber has a square patch at …