Abstract
Within the overarching framework of space-time metastructures, digital metasurfaces based on spatio-temporal coding are emerging as powerful and versatile architectures for complex field manipulations, also in view of their inherently programmable nature. Here, we provide a compact survey of our recent results and ongoing studies in this research area. Examples of field manipulations include harmonic beam steering and/or shaping and programmable nonreciprocal effects. Possible applications are abundant and range from wireless communications to radars and imaging.
Highlights
The concept of “digital” metastructures was put forward in 2014, independently, by the Groups led by Profs
Referring to an electromagnetic (EM) metasurface scenario [2], one may think of a set of reflecting elements, such as metallic patches laid on a grounded dielectric substrate, ideally characterized by a unit-amplitude reflection coefficient and a quantized phase response that can be univocally associated with a digital coding, for example, 0° and 180° in the simplest binary case, 0°, 90°,180° and 270° in a 2-bit case, and so on
With the mounting interest in space-time metastructures [21,22,23,24] characterized by spatially and temporally variant properties, it makes sense to exploit the temporal dimension as well, by applying a dynamic switching of the coding sequence. This is the key idea behind space-time coding digital metasurfaces [25], which extend and generalize the concepts of timemodulated arrays [26] and phase-switched screens [27,28], and have been successfully applied to several scenarios including harmonic beam steering and shaping [29], nonreciprocal effects [30], harmonic manipulations [31,32,33], scattering-signature control [34], wireless communications [35,36], and analog computing [37]
Summary
The concept of “digital” metastructures was put forward in 2014, independently, by the Groups led by Profs. With the mounting interest in space-time metastructures [21,22,23,24] characterized by spatially and temporally variant properties, it makes sense to exploit the temporal dimension as well, by applying a dynamic switching of the coding sequence This is the key idea behind space-time coding digital metasurfaces [25], which extend and generalize the concepts of timemodulated arrays [26] and phase-switched screens [27,28], and have been successfully applied to several scenarios including harmonic beam steering and shaping [29], nonreciprocal effects [30], harmonic manipulations [31,32,33], scattering-signature control [34], wireless communications [35,36], and analog computing [37]. We will illustrate several representative examples of application
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