Ultrathin flexible terahertz polarization converter based on metasurfaces

Mo, Wei-Cheng; Wei, Xuli; Wang, Kejia; Li, Yao; Liu, Jinsong

doi:10.1364/oe.24.013621

Cited by 68 publications

(29 citation statements)

References 40 publications

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“…The induced currents on the nanoantennas and the ground plane are antiparallel, thus generating a strong magnetic field inside the insulator, known as gap-surface plasmon modes. [25,26] Figure 2d,e show the design of nanorod antennas [21] and H-shaped antennas [22] operating in the nearinfrared and microwave regimes, respectively. The radiation phase can be efficiently tuned by simply changing the antenna length.…”

Section: Gap-plasmon Metasurfacesmentioning

confidence: 99%

“…The radiation phase can be efficiently tuned by simply changing the antenna length. [26][27][28][29][30] Meanwhile, since the reflected amplitude does not vary too much from one unit structure to another, one can merely focus on phase response in the design stage. As transmission is suppressed by the metallic ground plane, the conversion efficiency to the anomalous reflection mode can reach as high as 80%.…”

Section: Gap-plasmon Metasurfacesmentioning

confidence: 99%

“…Another category of polarization conversion metasurfaces works as half-wave plates (HWPs), rotating the direction of linear polarization. [26,33,69,[72][73][74][75][76][77] An example is shown in Figure 7a, which is composed of an array of 45°-rotated brick-shaped nanoantennas, a dielectric spacer, and a continuous metallic film. Under x-polarized light illumination, E i can be decomposed into two perpendicular components (E ui and E vi ) and excited orthogonal electric dipoles along the two principle axes of the nanobricks, respectively.…”

Section: Half-wave Platesmentioning

confidence: 99%

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Fundamentals and Applications of Metasurfaces

2017

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Metasurfaces have become a rapidly growing field of research in recent years due to their exceptional abilities in light manipulation and versatility in ultrathin optical applications. They also significantly benefit from their simplified fabrication process compared to metamaterials and are promising for integration with on‐chip nanophotonic devices owing to their planar profiles. The recent progress in metasurfaces is reviewed and they are classified into six categories according to their underlying physics for realizing full 2π phase manipulation. Starting from multi‐resonance and gap‐plasmon metasurfaces that rely on the geometric effect of plasmonic nanoantennas, Pancharatnam–Berry‐phase metasurfaces, on the other hand, use identical nanoantennas with varying rotation angles. The recent development of Huygens' metasurfaces and all‐dielectric metasurfaces especially benefit from highly efficient transmission applications. An overview of state‐of‐the‐art fabrication technologies is introduced, ranging from the commonly used processes such as electron beam and focused‐ion‐beam lithography to some emerging techniques, such as self‐assembly and nanoimprint lithography. A variety of functional materials incorporated to reconfigurable or tunable metasurfaces is also presented. Finally, a few of the current intriguing metasurface‐based applications are discussed, and opinions on future prospects are provided.

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Section: Gap-plasmon Metasurfacesmentioning

confidence: 99%

Section: Gap-plasmon Metasurfacesmentioning

confidence: 99%

Section: Half-wave Platesmentioning

confidence: 99%

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Fundamentals and Applications of Metasurfaces

2017

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“…The hyperbolic lens is a flat lens with superconducting plane waves that can perfectly focused. [58,59]. By designing different microstructures, flat lenses with different focal lengths can be obtained.…”

Section: Ree-dimensional Color Holographymentioning

confidence: 99%

Two-Dimensional Optical Metasurfaces: From Plasmons to Dielectrics

Liu

Song

Xiao

2019

Advances in Condensed Matter Physics

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Metasurfaces, kinds of planar ultrathin metamaterials, are able to modify the polarization, phase, and amplitude of physical fields of optical light by designed periodic subwavelength structures, attracting great interest in recent years. Based on the different type of the material, optical metasurfaces can be separated in two categories by the materials: one is metal and the other is dielectric. Metal metasurfaces rely on the surface plasma oscillations of subwavelength metal particles. Nevertheless, the loss caused by the metal structures has been a trouble, especially for devices working in transmit modes. The dielectric metasurfaces are based on the Faraday-Tyndall scattering of high-index dielectric light scattering particles. By reasonably designing the relevant parameters of the unit structure such as the size, direction, and shape, different functions of metasurfaces can realize and bring a wide range of applications. This article focuses on the metasurface concepts such as anomalous reflections and refractions and the working principle of different types of metasurfaces. Here, we briefly review the progress in developing optical over past few years and look into the near future.

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“…Thus, metasurfaces provide a novel way to manipulate EM waves, including their polarization state. In recent years, many metasurface-based polarization devices with diverse functionalities, such as linear to linear, linear to circular, and circular to circular polarization conversion, have been demonstrated 17–19 . The polarization converters that function in transmission mode usually have the disadvantages of being narrowband and having a low polarization conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth broadening of a linear polarization converter by near-field metasurface coupling

Gao

Singh

Yang

et al. 2017

Sci Rep

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We experimentally demonstrate a highly efficient, broadband linear polarization converter functioning at terahertz frequencies. The linear polarization converter is composed of three metasurfaces and two dielectric layers interlaced with each other. The neighboring unit cells of the central metasurface layer of the linear polarization converter exhibit strong electromagnetic coupling, which increases the number of resonances and results in significant bandwidth broadening. The simulation and experimental results show that in the frequency range of 0.2 to 0.4 THz, the proposed polarization converter has a flat transmission curve and exhibits a transmission efficiency that is higher than 80%. High performance terahertz polarization conversion is desirable in many fields, such as terahertz spectroscopy, imaging, and communications.

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Ultrathin flexible terahertz polarization converter based on metasurfaces

Cited by 68 publications

References 40 publications

Fundamentals and Applications of Metasurfaces

Fundamentals and Applications of Metasurfaces

Two-Dimensional Optical Metasurfaces: From Plasmons to Dielectrics

Bandwidth broadening of a linear polarization converter by near-field metasurface coupling

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