Tricontrollable pixelated metasurface for stopband for terahertz radiation

Abstract

Transmission of a normally incident plane wave through a pixelated metasurface with meta-atoms made up of graphene-patched and InSb-patched pixels on a silicon substrate was simulated using CST Microwave Studio TM 2019 software. This metasurface is electrically controllable due to the graphene-patched pixels, and it is magnetically as well as thermally controllable due to the InSbpatched pixels. A tricontrollable stopband with minimum transmittance as low as 0.05 can be achieved for operation in the terahertz gap.

Pixelated metasurfaces for linear-polarization conversion and absorption

“…The spatial profiles of the electric and magnetic fields in each meta-atom were used to explain these functionalities, which can be displayed not only for normal illumination but also for a wide range of oblique-incidence conditions. We expect that coarser or finer pixels may be chosen, depending on manufacturing capabilities, with patches of diverse materials incorporated for multicontrollable metasurfaces [21,22].…”

“…In an emerging approach for meta-atom design, the meta-atom is itself conceived as a finite biperiodic array of discrete pixels. The pixels may have simple [17][18][19][20][21][22][23][24][25][26] or complex shapes [27][28][29][30][31]. The pixels in a meta-atom can even be patched with different materials for multifunctionality and multicontrollability [17,[21][22][23]28].…”

“…The pixels may have simple [17][18][19][20][21][22][23][24][25][26] or complex shapes [27][28][29][30][31]. The pixels in a meta-atom can even be patched with different materials for multifunctionality and multicontrollability [17,[21][22][23]28]. Not only can the pixel shape and dimensions be optimized, but also the number and the placement of pixels patched with a particular material.…”

“…Without constraining the meta-atom geometry to be symmetric, the pixelated-meta-atom approach provides the designer the ability to systematically optimize the meta-atom design with each pixel contributing significantly towards the overall performance of the metasurface. This approach was been employed for absorption [21,23], bandstop filtering [22], beam deflection [27], holography [28], radar-cross-section reduction [29,30], polarization-state detection [31], and molecular detection [20]. Let us note that simple square pixels are sufficient to represent complex shapes, as exemplified by the outputs of dot-matrix printers.…”

Thermally switchable polarization manipulation and diodelike transmission in scalable, resonator-free, mid-infrared metasurfaces with vanadium-dioxide grids

“…The research landscape for polarization control changed dramatically when tunable materials were introduced to metasurfaces and metamaterials, thereby enabling reconfigurable and multifunctional devices [13][14][15]. Magnetically, electrically, thermally, and optically tunable materials such as graphene, InAs, InSb, GeTe, CdTe, VO 2 , and ITO are often considered, in this context.…”