Multichannel direct transmissions of near-field information

Abstract

A digital-coding programmable metasurface (DCPM) is a type of functional system that is composed of subwavelength-scale digital coding elements with opposite phase responses. By configuring the digital coding elements, a DCPM can construct dynamic near-field image patterns in which the intensity of each pixel of the image can be dynamically and independently modulated. Thus, a DCPM can perform both spatial and temporal modulations. Here, this advantage is used to realize multichannel direct transmissions of near-field information. Three points are selected in the near-field region to form three independent channels. By applying various digital phase codes on the DCPM, independent binary digital symbols defined by amplitude codes (namely, weak and strong amplitudes) are transmitted through the three channels. The measured near-field distributions and temporal transmissions of the system agree with numerical calculations. Compared with the conventional multichannel transmission, the proposed mechanism achieves simultaneous spatial and temporal modulations by treating DCPM as an energy radiator and information modulator, thereby enduing DCPM with high potential in near-field information processing and communications.

Programmable anisotropic digital metasurface for independent manipulation of dual-polarized THz waves based on a voltage-controlled phase transition of VO2microwires

“…Hence, we have driven VBAM by the required phase profile which calculated to concentrate the reflected energy at = -300 , = -400 and = 100 for the first segment and = 200 , = 400 and = 100 for the second segment. The whole space scanning characteristic of the proposed anisotropic metasurface was successfully clarified with this illustrative example which has promising perspectives in applications of reconfigurable compact metalens for imaging [39] and near-field communication [40].…”

Active Anisotropic Coding Metasurface with Independent Real‐Time Reconfigurability for Dual Polarized Waves

“…Actually, the active anisotropic coding metasurface can also be used to control the near-filed behaviors, which has promising perspectives in applications of compact lens, [34] near-field communication, [43] etc. Actually, the active anisotropic coding metasurface can also be used to control the near-filed behaviors, which has promising perspectives in applications of compact lens, [34] near-field communication, [43] etc.…”

Tunable, reconfigurable, and programmable metamaterials

“…In Ref. , Wan et al proposed a digital‐coding programmable metamaterial (DCPM) which is composed of programmable particles with opposite reflected phase responses. A DCPM can be utilized to control the near‐field image patterns dynamically and the intensities of the patterns can be modulated independently and dynamically by arraying the particles suitably.…”

“…Reproduced with permission from Ref. . © 2019 Springer Nature [Color figure can be viewed at wileyonlinelibrary.com]…”

“…In recent years, many functions and devices based on programmable metamaterials have been reported including holograms, 95 imager systems, 89,[96][97][98][99] and communication systems. 90,[100][101][102][103] In this article, we will summarize the recent progress on metamaterials from two aspects: tunable and reconfigurable metamaterials in terahertz and microwave frequencies; the functional devices and novel systems by the programmable metamaterials.…”