The novel hybrid metal-graphene metasurfaces for broadband focusing and beam-steering in farfield at the terahertz frequencies

Zhang, Zhang; Yan, Xin; Liu, Liang; Wei, Dequan; Wang, Meng; Wang, Yaru; Yao, Jianquan

doi:10.1016/j.carbon.2018.02.095

Cited by 63 publications

(32 citation statements)

References 37 publications

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“…It has been theoretically predicted to be a suitable material for making reversibly tunable meta‐lenses. [ 121–126 ] However, the experimental fabrication of graphene‐based tunable meta‐lenses is still challenging and limited by the fabrication techniques.…”

Section: Functionalitiesmentioning

confidence: 99%

Principles, Functions, and Applications of Optical Meta‐Lens

Chen

Feng

et al. 2021

Advanced Optical Materials

147

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A meta‐lens is an advanced flat optical device composed of artificial antennas. The amplitude, phase, and polarization of incident light can be engineered to satisfy the application requirements of meta‐lenses. Meta‐lenses can be designed to achieve a variety of functions, such as diffraction‐limited focusing, high focusing efficiency, and aberration correlation, which are useful in various application scenarios. This review focuses on the recent progress in meta‐lenses, from fundamentals to applications. The present challenges in this domain are summarized and future prospects are offered. The primary aim of this review is to provide the reader with a comprehensive understanding of meta‐lenses and potential inspiration for designing high‐performance meta‐lenses for feasible applications.

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Section: Functionalitiesmentioning

confidence: 99%

Principles, Functions, and Applications of Optical Meta‐Lens

Chen

Feng

et al. 2021

Advanced Optical Materials

147

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“…Thereafter, powerful programmable metasurfaces have been designed and contributed to different fields such as holography [106], imaging [107], space-time modulation [108], and communication system [109,110], while in the terahertz spectrum, programmable metasurfaces are less studied, attributed to the difficulty not only in realizing tunability per unit cell but also in connecting sophisticated bias lines. In recent years, several theoretical analyses and simulation verifications of terahertz programmable metasurfaces have emerged as valuable attempts in this intriguing spectrum [111][112][113][114]. Without considering sample fabrications as well as actual bias connections, programmable metasurfaces based on tunable components such as VO 2 , semiconductor germanium (Ge), and graphene have been proposed to demonstrate the feasibility of realizing real-time control and conversion of various functions.…”

Section: Programmable Metasurfacesmentioning

confidence: 99%

Terahertz Metasurfaces: Toward Multifunctional and Programmable Wave Manipulation

et al. 2020

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Metasurfaces, composed of prearranged artificial unit cells possessing different electromagnetic (EM) responses, provide unprecedented abilities to realize versatile wave manipulations. Especially in the terahertz spectrum, metasurfaces attract broad attention by opening up further possibilities for wave regulating. Terahertz applications in various fields, for instance, spatial light modulation (SLM), radar, imaging, time-domain spectroscopy (TDS), and high-speed communication, have been facilitated and improved. In this article, we first give a simple review on recent advances on terahertz metasurfaces, including discussion of passive metasurfaces with fixed structures and active metasurfaces integrated with tunable components. Then, we briefly review the development of coding metasurfaces and programmable metasurfaces represented by digitized bits. We mainly focus on some powerful functions, functional multiplexing, and real-time controlled applications in terahertz frequencies. Finally, we give an abbreviated overview of developing terahertz multifunctional metasurfaces and programmable metasurfaces.

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“…It is an interesting idea to use diffractive structures with extended depth of focus as optical elements focusing at a particular distance the radiation with a broader spectral range and maintaining small thickness [ 84 , 85 ]. However, in recent years, a vast majority of optical elements working broadband have been designed using metamaterials [ 76 , 86 , 87 ].…”

Section: Efficient Focusing Of Thz Radiationmentioning

confidence: 99%

The Magic of Optics—An Overview of Recent Advanced Terahertz Diffractive Optical Elements

Siemion

2020

Sensors

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Diffractive optical elements are well known for being not only flat but also lightweight, and are characterised by low attenuation. In different spectral ranges, they provide better efficiency than commonly used refractive lenses. An overview of the recently invented terahertz optical structures based on diffraction design is presented. The basic concepts of structure design together with various functioning of such elements are described. The methods for structure optimization are analysed and the new approach of using neural network is shown. The paper illustrates the variety of structures created by diffractive design and highlights optimization methods. Each structure has a particular complex transmittance that corresponds to the designed phase map. This precise control over the incident radiation phase changes is limited to the design wavelength. However, there are many ways to overcome this inconvenience allowing for broadband functioning.

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The novel hybrid metal-graphene metasurfaces for broadband focusing and beam-steering in farfield at the terahertz frequencies

Cited by 63 publications

References 37 publications

Principles, Functions, and Applications of Optical Meta‐Lens

Principles, Functions, and Applications of Optical Meta‐Lens

Terahertz Metasurfaces: Toward Multifunctional and Programmable Wave Manipulation

The Magic of Optics—An Overview of Recent Advanced Terahertz Diffractive Optical Elements

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