Design and simulation of reflect-array metasurfaces in the visible regime

Abstract

Metasurfaces are new, promising ultrathin materials that can enable many novel optical devices due to their ability to act as a discontinuity interface that introduces an abrupt change in amplitude, phase, and sometimes the polarization of the incident light at the wavelength scale. Therefore they can function as flat optical elements. Here, we investigate the anomalous reflection of light for transverse-magnetic (TM) polarization for normal and oblique incidence in the visible regime. We propose gradient phase gap-surface plasmon metasurfaces that exhibit high conversion efficiency (up to ∼97% of total reflected light) to the anomalous reflection angle for blue, green, and red wavelengths at normal and oblique incidence, and where light polarization is unchanged after the reflection.

Coupled Plasmon Wave Dynamics beyond Anomalous Reflection: A Phase Gradient Copper Metasurface for the Visible to Near-Infrared Spectrum

“…So, the prominent order of the power flows shifted to a positive first-order diffraction after the reflection or transmission [5,7,20]. For wider angle and higher efficiency anomalous reflection (AR) in the 500-950 nm broadband range, we obtained the optimal aspect ratio and length of the trapezoid, as shown in Figure 1b,e,f and Figure S1.1b.…”

“…This does not occur for the rectangle nanoantenna shape we see in figures 3b. If we compare x-phase (figure 2b) with the TM reflection profile (figure 1d), for the 550L trapezoid, the abrupt phase change around 900 nm of wavelength causes the reflection to drop, and that can be attributed to the cavity gap surface plasmon (GSP) resonance, as we see when bringing comparison with the rectangle [8,10,19,21]. Same for the 918L trapezoid; the small amount of phase change at 655 and 809 nm of wavelength shows the effect of reflection drop.…”

“…The subscript with m signifies the diffraction order. Equation 1 is a simple grating equation with a maximum of 2π accumulation of the additional phase within the one periodicity of the unit cell; the term gives dφ(x)/dx= 2π/Px 𝑛 𝑟,𝑡 𝑠𝑖𝑛𝜃 𝑟,𝑡 − 𝑛 𝑖 𝑠𝑖𝑛𝜃 𝑖 = (𝑚 0 + 1) 𝜆 0 𝑃 𝑥 (2) So, the prominent order of power flow shifts to the positive 1 st diffraction order after reflection or transmission [5,7,19]. For wider angle high-efficiency anomalous reflection for 500-950 nm broadband regime, we have come up with the optimized aspect ratio and length of the trapezoid shown in figures 1b, 1e, 1f, and S1.1b.…”

Broadband Polarization Conversion Metasurface Based on Metal Cut-Wire Structure for Radar Cross Section Reduction

“…As a subwavelength artificial composite, metamaterial (MM) has some exotic electromagnetic (EM) properties that are unavailable in nature [ 1 , 2 , 3 , 4 ]. Research on MM has inspired many novel applications, including perfect lens imaging, inverse doppler effect, abnormal tunneling and many other phenomena [ 5 , 6 , 7 , 8 , 9 , 10 ]. As a two-dimensional (2D) planar form of MM [ 11 , 12 , 13 , 14 , 15 ], metasurfaces (MS) are constituted of subwavelength element arrays and have superior performance in tailoring the EM waves, which can be used to control the reflection/refraction wavefront in a smaller size range.…”

Study of Energy Scattering Relation and RCS Reduction Characteristic of Matrix-Type Coding Metasurface

“…In recent years, as an important branch of MS, phase gradient metasurface (GMS) with low RCS has been paid great interest due to its tremendous potential in military practice [25][26][27][28]. This kind of MS merely reflects the incident waves into the backward space rather than transforming EM energy into heat, which lowers the probability of MS being detected by infrared devices [29][30][31][32].…”