Design of Anomalous Reflectors by Phase Gradient Unit Cell-Based Digitally Coded Metasurface

Field-programmable beam reconfiguring based on digitally-controlled coding metasurface

Digital phase shifters have been applied in traditional phased array antennas to realize beam steering. However, the phase shifter deals with the phase of the induced current; hence, it has to be in the path of each element of the antenna array, making the phased array antennas very expensive. Metamaterials and/or metasurfaces enable the direct modulation of electromagnetic waves by designing s...

Digitally Coded Electromagnetic Transducers

Electromagnetic transducers had previously been shown to be capable of acting as pulse to achieve improved range resolution. Compression was achieved using pairs of transducers designed to produce or detect a burst with a linear frequency variation. An alternate approach, which is also easier to fabricate, is to impress a digital phase code on single frequency coils. One such code with good aut...

extremal region detection guided by maxima of gradient magnitude

a problem of computer vision applications is to detect regions of interest under dif- ferent imaging conditions. the state-of-the-art maximally stable extremal regions (mser) detects affine covariant regions by applying all possible thresholds on the input image, and through three main steps including: 1) making a component tree of extremal regions’ evolution (enumeration), 2) obtaining region ...

Phase-gradient gap-plasmon metasurface based blazed grating for real time dispersive imaging

Geometric phase coded metasurface: from polarization dependent directive electromagnetic wave scattering to diffusion-like scattering

Ultrathin metasurface compromising various sub-wavelength meta-particles offers promising advantages in controlling electromagnetic wave by spatially manipulating the wavefront characteristics across the interface. The recently proposed digital coding metasurface could even simplify the design and optimization procedures due to the digitalization of the meta-particle geometry. However, current ...