WebFeb 21, 2024 · Metasurface is an artificial material composed of a series of subwavelength structure units and has unique electromagnetic characteristics. Based on the ability of manipulating the phase, amplitude, and polarization of electromagnetic wave, various kinds of metasurfaces are designed to realize wavefront manipulations, such as beam focusing, … WebMar 9, 2024 · As the electromagnetic fields propagate to the metasurface plane, the angular spectrum can be written as: where z is propagation distance, λ is wavelength. Equation ( 2) indicates that the angular spectrum of any plane in the propagation direction can be calculated by the angular spectrum of a known plane.
Three-channel metasurface based on simultaneous and ... - PubMed
WebDec 8, 2024 · An elastic metasurface with a gradient index of functional units, namely gradient folding metasurface (GFMS), is proposed to simultaneously manipulate the transmission phase and amplitude of flexural waves. By varying the gradient index common ratio (CR) between each adjacent unit, the GFMS was found to cover an entire 2 π span of … WebOct 26, 2024 · Here, a dynamic phase-change metasurface design that enables transmissive phase modulation covering over 240° with high-level transmisstance maintained over 0.8 … bau sete
Adjoint-optimized metasurfaces for compact mode-division …
We tailored the ‘array factor’ and ‘form factor’ of the gradient metasurface structure to realize efficient conversion between two waveguide modes. From the perspective of ray optics, the wavevector of each waveguide mode has a characteristic bending angle (Fig. 1). Therefore, the role of the gradient metasurface … See more The devices were fabricated by a combination of chemical vapour deposition, electron-beam lithography and reactive ion etching. For the devices supporting … See more The devices that support asymmetric optical power transmission (Fig. 3) consist of a Y-branch waveguide and two gradient metasurfaces with opposite orientations. Each waveguide … See more WebThis model unifies propagation-and geometric-phase metasurface [40,41]. Both the geometric parameters and rotation angle of the antenna pixels are engineered to achieve … WebJan 1, 2024 · Both the propagation and geometric phase can be used to modulate wavefront for the single-layer chiral metasurface. The construction process of Jones transmission … bau sider para hr