Anomalous Refraction and Nondiffractive Bessel-Beam Generation of Terahertz Waves through Transmission-Type Coding Metasurfaces

Liu, Shuo; Noor, Ahsan; Du, Liang; Zhang, Lei; Xu, Quan; Luan, Kang; Wang, Tian Qi; Tian, Zhen; Tang, Wenxuan; Han, Junyu; Zhang, Wei Li; Zhou, Xiao; Cheng, Qiang; Cui, Tie Jun

doi:10.1021/acsphotonics.6b00515

Cited by 191 publications

(128 citation statements)

References 52 publications

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“…Few‐layer metasurfaces can not only realize the beam deflectors, but also realize the metalenses, vortex beam generators, Bessel‐beam generators, coding metasurfaces, phase holograms, virtual shaping, and some other phase manipulation devices. Metalenses can be designed by imposing a hyperboloidal transmission/reflection phase profile on the metasurfaces to convert incident planar wavefronts into spherical ones .…”

Section: Prominent Applications In Few‐layer Metasurfacesmentioning

confidence: 99%

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Chen

Zhang

et al. 2019

Advanced Optical Materials

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applications have been realized based on the metamaterials, such as negative index materials, [3] invisibility cloaks, [4] and zeroindex materials. [5] Nevertheless, metamaterials are usually bulky, difficult to be fabricated, and suffer from high energy losses, which hinder their practical applications in modern photonic systems. In recent years, planar metasurfaces, the 2D equivalents of metamaterials, have attracted plenty of attentions due to their extraordinary abilities in controlling the polarization, amplitude, phase, and dispersion of electromagnetic waves. [6][7][8] Compared with bulk metamaterials, the metasurfaces have many advantages, such as ultrathin thicknesses, low losses, ease of fabrication and integration. Over the past years, single-layer metasurfaces have been widely applied in realizing polarization conversion, [9] beam deflectors, [10,11] metalenses, [12,13] holograms, [14] coding, [15] structural colors, [16,17] nonlinear metasurfaces, [18] and some other applications. Nevertheless, the interactions between lights and ultrathin single-layer metasurfaces are usually limited, resulting in low efficiency and limited controllability in some applications. [19] Moreover, the degrees of freedom for light manipulation provided by a single-layer metasurface are usually not enough in realizing multifunctional devices and some other sophisticated photonic systems.Few-layer metasurface that contains more than one functional layer provides an effective method to overcome the drawbacks of both bulk metamaterials and single-layer metasurfaces. Cheng et al. employed the concept of few-layer metasurfaces to discuss the advantages and emergent functionalities of them in ref. [20]. Few-layer metasurfaces retain the advantages of single-layer metasurfaces and can provide more degrees of freedom to manipulate electromagnetic waves. More importantly, the abundant layer effects, such as the multiple wave interference between layers and the near-field coupling effects, can enhance the interactions between lights and structures and improve the efficiency of few-layer systems. In addition, the combination of different functional layers can produce novel functions that single-layer metasurfaces can hardly realize. For example, by breaking the mirror symmetry along the propagation direction, few-layer metasurfaces can realize asymmetric transmission of linearly polarized lights. [21] By vertically integrating different metasurfaces on one substrate, optical systems with different functions can be miniaturization and integration. Recently, the few-layer metasurfaces have also been extended in the acoustic fields to realize some novel applications, such Metamaterials are 3D artificial structures proposed to surpass conventional natural materials and realize novel functions beyond traditional optical elements. Nevertheless, they are usually bulky and difficult to be fabricated. As 2D equivalents of metamaterials, metasurfaces have been proposed to overcome the drawbacks of metamaterials and fully control the polarizati...

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Section: Prominent Applications In Few‐layer Metasurfacesmentioning

confidence: 99%

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Chen

Zhang

et al. 2019

Advanced Optical Materials

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“…However, the high Ohmic loss of plasmonic metasurface results in a significantly suppressed efficiency. The newly developed dielectric and multilayered plasmonic metasurfaces can drastically improve the efficiency, but result in the complexity of design and fabrication, hindering their practical applications. To meet the requirements of future THz communications, exploring planar THz photonics with simple configuration, low loss, and low cost is imperative.…”

Section: Introductionmentioning

confidence: 99%

Planar Terahertz Photonics Mediated by Liquid Crystal Polymers

Shen

Tang

Chen

et al. 2020

Advanced Optical Materials

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Terahertz (THz) band is expected to satisfy the ever‐increasing demand for high‐capacity wireless data transfer. Multifunctional photonic devices with compactness and low loss are highly pursued for future THz communications. Here, a strategy for planar THz photonics is proposed that enables free wavefront manipulation with submillimeter thin liquid crystal polymer (LCP) films. Such elements work on the spatial geometric phase modulation, which is accomplished by preprogramming the axis orientations of LCP. The LCP monomers follow the guidance of local photoalignment agent and are further polymerized under UV exposure at the existence of a doped photo‐initializer. Thanks to the high resolution and excellent flexibility of the photopatterning technique, THz elements with versatile functions can be realized. As examples, waveplates, polarization gratings, and lenses, which are suitable for the polarization control, beam deflecting, focusing, or collimating, are demonstrated. Due to the intrinsic flexibility of LCP films, an f‐tunable lens enabled by mechanically induced deformation is exhibited. Specific mode generators for vortices and Bessel beams are also presented, which can function as separate channels for the mode division multiplexing in THz communications. This work provides a robust platform for fabricating integrated, low‐loss, and tunable THz elements suitable for the advanced THz apparatuses.

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“…However, an additional horn antenna was required to launch the reference wave for the phase compensation, which increases the overall complexity of the Bessel antenna. In recent years, some transmission‐type coding metasurfaces have been developed with predesigned coding sequences to manipulate the wavefront of electromagnetic waves . A latest study reported that a novel transmission‐type coding metasurface had the ability to bend the nondiffractive Bessel beam.…”

Section: Introductionmentioning

confidence: 99%

“…However, this coding metasurface had a complicated three‐layer structure. These state‐of‐the‐art Bessel deflection antennas were designed by using the scalar method, and the Bessel beam in different oblique directions was controlled by changing the frequency . However, for the fixed‐frequency and/or narrow‐band systems, these Bessel deflection antennas may not be good candidates.…”

Section: Introductionmentioning

confidence: 99%

A reconfigurable Bessel antenna for near‐field beam deflection

Cheng

Yang

et al. 2020

Micro & Optical Tech Letters

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This letter presents a reconfigurable leaky‐wave antenna for near‐field beam manipulation. The proposed antenna is based on a radial waveguide and a reconfigurable capacitive sheet, which is divided into four regions. To realize the reconfigurability, PIN diodes are electrically soldered to the gap between the adjacent patches in the upper surface except for the isolation zone, where no diodes are printed. By switching the states of PIN diodes in each region by turns, wavenumbers with two different azimuths are generated, thus the near‐field beam deflection can be achieved in different regions. By using the Genetic Algorithm, the PIN diodes are optimally deployed for realizing high antenna efficiency. The simulated (measured) results show that with the implementation of the reconfigurable capacitive sheet results in a near‐field beam scanning property. The beam deflection at a tilted angle of 17.4° (16.2°) can be achieved in different regions.

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Anomalous Refraction and Nondiffractive Bessel-Beam Generation of Terahertz Waves through Transmission-Type Coding Metasurfaces

Cited by 191 publications

References 52 publications

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Planar Terahertz Photonics Mediated by Liquid Crystal Polymers

A reconfigurable Bessel antenna for near‐field beam deflection

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