Spin‐ and Space‐Multiplexing Metasurface for Independent Phase Controls of Quadruplex Polarization Channels

Abstract

Spin‐decoupled metasurfaces can realize independent phase controls of two orthogonally circularly polarized (CP) waves, and hence have attracted much attention in recent years. However, all previously reported metasurfaces capable of simultaneously manipulating the transmission and reflection of CP waves can only achieve two decoupled polarization conversion channels. In this work, a spin‐ and space‐multiplexing metasurface is proposed, that can achieve independent phase controls of four different CP conversion channels, including two cross‐polarized transmission channels and two co‐polarized reflection channels. The performance of the metasurface is experimentally validated by multi‐channel independent holographic imaging. The results show that four independent holograms are realized in four CP conversion channels by only using a single metasurface, which can greatly improve the information capacity of the metasurfaces and make full use of polarization and space resources.

Performance analysis and prediction of tunable metasurface filter based on electrochemical metallization

“…Metasurface is an artificial plane material with smaller thickness than the wavelength [1]. Metasurfaces have excellent electromagnetic properties beyond the limitation of natural materials [2], which showing a variety of flexible control of parameters such as amplitude [3], phase [4,5], polarization [6], etc. Therefore, due to the application in the spectrum range from terahertz to visible light [7], such as filters [8,9], biosensors [10][11][12][13], perfect absorbing materials [14,15] * Author to whom any correspondence should be addressed.…”

Direction-Duplex Janus Metasurface for Full-Space Electromagnetic Wave Manipulation and Holography

“…To overcome the above problem, the concept of “Janus metasurface” is proposed to mimic the two-faced god in Roman mythology that enables a single metasurface to integrate one functionality for a wave propagating along one direction but a totally different one for the opposite direction with the same incident polarization, for example, projecting distinct free-space holographic images for incidences with an opposite propagation direction. , The underlying mechanism is to induce asymmetric transmission behavior by chiral structures and their intrinsic giant chiral properties − from judiciously designed asymmetric spatial configurations. Due to the promising perspective of Janus metasurfaces in miniaturized and highly integrated multifunctional systems, extensive efforts have been devoted to exploring new design methods, extending overall channels, and enhancing performances, ,− such as segmented metasurfaces for transmission and reflection controls, composite geometry phase and propagation phase metasurface for energy-tailorable wave modulation, frequency-multiplexed metasurface for transmission control at distinct frequencies, etc.…”

Spin-decoupled bifunctional metasurface for THz wavefront manipulation

“…The spin-decoupled metasurfaces designed from these phase components have been demonstrated to generate two independent phase wavefronts and achieve bifunctional wavefront manipulation [23][24][25]. However, metasurface researches based on this method have mainly focused on visible light [24], infrared [23] and microwave [26,27] ranges, and rarely involves the THz band. Therefore, it is necessary to design a spin-decoupled bifunctional metasurface to enrich THz wavefront manipulation.…”