Ultrathin and Ultra‐Broadband Terahertz Single‐Layer Metasurface Based on Double‐Arrow‐Shaped Resonator Structure for Full‐Space Wavefront Manipulation

Abstract

In this paper, a simple design of an ultrathin and ultra-broadband single-layer MS based on double-arrow-shaped resonator (DASR) structure for both transmission and reflection modes in terahertz (THz) region is presented. The single-layer MS is composed of a periodic array of the combination of the metal DASR and complementary circular patch (CCP) adhered on an ultrathin dielectric substrate. Numerical results show that the MS structure can convert CP wave to its orthogonal component after reflection and transmission simultaneously, and the corresponding amplitudes are ≈0.45 on average from 0.45 to 1.75 THz with a relative bandwidth of 118.2%, in which the CP conversion efficiency is closing to theoretical limit (25%) of the single-layer structure. Furthermore, the 0-2𝝅 phase shifts for the reflected and transmitted orthogonal CP wave can be achieved simultaneously by adjusting the oriented angle (𝜶) of the DASR structure along the wave propagation direction. For the concept proofs, wave beams deflection, vortex beam generation, and focusing effect for both reflection and transmission modes are demonstrated numerically. The design can provide new possibilities and potential to develop multifunctional full-space devices.

Reconfigurable angle sensitive metasurface for multibeam manipulation

“…[1][2][3][4] More recently, various metasurfaces have been proposed intensively, which could achieve wavefront manipulation for both reflection and transmission modes. [5][6][7][8] Nevertheless, most current works are implemented with functions controlled by polarization or frequency while seldom involve the incidence angle, which may have significantly hindered their potential applications. 9,10 The angle characteristic of metasurface is one of the key points in current research and design.…”

“…It can manipulate the amplitude, phase, and polarization of electromagnetic waves 1–4 . More recently, various metasurfaces have been proposed intensively, which could achieve wavefront manipulation for both reflection and transmission modes 5–8 . Nevertheless, most current works are implemented with functions controlled by polarization or frequency while seldom involve the incidence angle, which may have significantly hindered their potential applications 9,10 .…”

Ultrathin Narrowband and Bidirectional Perfect Metasurface Absorber

“…By altering the geometrical shape and dimensions of the unit cell structures, MSs can tailor the effective EM parameters (complex permittivity and permeability) and provide much more design flexibility than conventional materials. Over the past few decades, MSs have gained considerable attention due to their numerous promising applications, such as in flat metalenses [2,3], imaging [4], filters [5,6], wavefront manipulating devices [7][8][9][10], detectors [11], sensors [12], polarization convertors [13][14][15], and absorbers [16,17]. In particular, since the invention of the concept of a perfect absorber based on MMs by Landy [16], numerous metasurface absorbers (MSAs) have been proposed and implemented for the microwave, THz, and even for the visible frequency regions [17][18][19][20][21][22][23][24][25][26].…”