High-efficiency electrically direction-controllable spoof surface plasmon polaritons coupler

Abstract

We propose a design of high-efficiency and direction-controllable spoof surface plasmon polaritons (SSPPs) coupler based on a Pancharatnam–Berry (PB) metasurface and a diode-controlled, linear-to-circular polarization conversion metasurface (PCM). The PB metasurface was designed to achieve high-efficiency excitation of SSPPs by manipulating the phase distribution. The PCM was placed above the PB metasurface at a certain distance, and the propagation direction of SSPPs could be controlled by changing the bias voltage of PCM. To validate the feasibility of the proposed design, a SSPPs coupler was fabricated and assessed. The experimental results were in good agreement with the simulation results. The conversion efficiency from the free space wave to SSPPs was obtained to be as high as 0.76 at 10 GHz, and the propagation direction of SSPPs became controllable under the normal incidence of x-polarized waves on the PCM. Compared to conventional devices such as prism, grating, and gradient-index metasurfaces, the proposed SSPPs coupler is more suitable for SSPPs excitation, thereby providing an interesting route toward developing plasmonic devices.

Spoof surface plasmonics: principle, design, and applications

“…Besides, when the capacitance varies from 0.8 to 0.3 pF, the measured results in figure 19(d) illustrate that the central frequency of isolation (S23) shifts from 0.9 to 1.1 GHz, exhibiting a tunability of 20%. Besides, compared to conventional devices such as prism, grating, and gradient-index metasurfaces, a design of high-efficiency and direction-controllable coupler based on a Pancharatnam-Berry metasurface and a diode-controlled, linear-to-circular polarization conversion metasurface (PCM) has been proposed by Yuan' s team in 2020, which is more suitable for SSPPs excitation, thereby providing an interesting route toward developing plasmonic devices [106].…”

Wearable Spoof Surface Plasmon Polariton Transmission Line

“…Then it is named Spoof Surface Plasmon E3S Web of Conferences 351, 01090 (2022) https://doi.org/10.1051/e3sconf/202235101090 ICIES'22 2 Polariton (SSPP) [2]. Different structures have been proposed to generate SSPP such as a one-dimensional array of grooves [3] [4], a two-dimensional array of square holes [2], metasurfaces of square patches [5] and mushroom structures [6] [7]. Generally, a surface wave is introduced on the metasurface by adding a metallic periodicity with a period lower than the wavelength (sub-wavelength condition).…”

Wireless Experimental Determination of Dispersion Curves of Spoof Surface Plasmon Polariton Modes Supported by a Transmission Line

“…Such a surface wave mimics the surface plasmon polariton (SPP) commonly used in plasmonics, and then it is called spoof surface plasmon polariton (SSPP). [ 1 ] Different structured surfaces were proposed for guiding SSPP as conducting surfaces perforated by holes, [ 2 ] mushroom structures, [ 3,4 ] metasurfaces made of square or rectangular patches, [ 5,6 ] and periodic chains of laterally opened, [ 7,8 ] or closed [ 9 ] metallic cuboids (“dominos”). The mushroom‐ and patch‐based structures are commonly considered as an effective impedance surface supporting transverse magnetic (TM) and transverse electric (TE) modes.…”

“…The mushroom-and patch-based structures are commonly considered as an effective impedance surface supporting transverse magnetic (TM) and transverse electric (TE) modes. [3][4][5][6]10] A bound TM mode can also be supported by a periodic chain of cuboids. It was experimentally shown that the dispersion curve is invariant with the lateral width of the cuboids [7] and that the dispersion curve moves slightly downward by reducing the lateral size of a metallic grating structure down to subwavelength scale.…”

“…As a generality, the electromagnetic field confinement is achieved when the magnitude of the wave vector k of the SSPP is greater than the wave vector in free space k 0 . Depending on the involved technology for the surface waveguide, a wave vector converter [5,6] or a taper [15,19,[23][24][25] is often required to convert incident wave to SSPP. [26] An SSPP can also be excited by means of nearfield coupling with a prism in Otto configuration [3,4] or by nearfield coupling with a monopole antenna.…”