Graphene ribbon based tunable terahertz metalens for dual polarization incidences

Zhang, Yuhui; Ma, Linfeng; Liu, Zhiying; Fu, Yuegang

doi:10.1016/j.optmat.2019.109325

Cited by 15 publications

(11 citation statements)

References 25 publications

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“…However, the uniform graphene sheet cannot meet increasing demand on the versatile material parameter change and the unprecedented electromagnetic control. Therefore, graphene metamaterials or metasurfaces with specific shapes are largely adopted and investigated in recent years [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. Many studies show that graphene metasurfaces demonstrate more superior properties compared to those on the uniform sheet, such as enhanced transmission [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ], more versatile wave control [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], the tighter field confinement [ 37 , 38 , 39 , 40 , 41 , 42 ], etc.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, graphene metamaterials or metasurfaces with specific shapes are largely adopted and investigated in recent years [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. Many studies show that graphene metasurfaces demonstrate more superior properties compared to those on the uniform sheet, such as enhanced transmission [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ], more versatile wave control [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], the tighter field confinement [ 37 , 38 , 39 , 40 , 41 , 42 ], etc. A plethora of periodical graphene metasurfaces are proposed, such as graphene patches or ribbons [ 22 , 23 , 24 , 25 , 26 …”

Section: Introductionmentioning

confidence: 99%

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Dispersion Theory of Surface Plasmon Polaritons on Bilayer Graphene Metasurfaces

Liu¹,

Ren

Yin

et al. 2022

Nanomaterials

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Surface plasmon polaritons (SPPs) on the graphene metasurfaces (GSPs) are crucial to develop a series of novel functional devices that can merge the well-established plasmonics and novel nanomaterials. Dispersion theory on GSPs is an important aspect, which can provide a basic understanding of propagating waves and further guidance for potential applications based on graphene metamaterials. In this paper, the dispersion theory and its modal characteristics of GSPs on double-layer graphene metasurfaces consisting of the same upper and lower graphene micro-ribbon arrays deposited on the dielectric medium are presented. In order to obtain its dispersion expressions of GSP mode on the structure, an analytical approach is provided by directly solving the Maxwell’s equations in each region and then applying periodical conductivity boundary onto the double interfaces. The obtained dispersion expressions show that GSPs split into two newly symmetric and antisymmetric modes compared to that on the single graphene metasurface. Further, the resultant dispersion relation and its propagating properties as a function of some important physical parameters, such as spacer, ribbon width, and substrate, are treated and investigated in the Terahertz band, signifying great potentials in constructing various novel graphene-based plasmonic devices, such as deeply sub-wavelength waveguides, lenses, sensors, emitters, etc.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dispersion Theory of Surface Plasmon Polaritons on Bilayer Graphene Metasurfaces

Liu¹,

Ren

Yin

et al. 2022

Nanomaterials

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“…Metasurfaces have characteristics that are not available in natural materials [1][2][3][4][5][6][7][8][9] and have obvious advantages in size, volume, processing [10,11], etc., meeting the requirements of miniaturization and integration in modern technology, making them key research objects for a large number of scientific researchers. Metalens is a two-dimensional plane lens based on metasurfaces, which realizes the focusing function of a traditional lens by integrating the transmission phase or reflection phase [12][13][14]. Metalens is different from the traditional lens; it has a subwavelength size, which is advantageous to the processing and miniaturization of the device.…”

Section: Introductionmentioning

confidence: 99%

Research on Fabrication Techniques and Focusing Characteristics of Metalens

Zhang

et al. 2022

Coatings

Self Cite

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Metalenses have recently attracted increased attention due to their remarkable characteristics. The fabrication technology of metalenses has also become an important research direction. In this study, we propose a metalens structure based on Au–MgF2–Au in infrared waveband. The preparation process of the metalens included magnetron sputtering, electron beam evaporation, and electron beam exposure. A dose test was performed during the exposure process, adjusting the exposure dose to minimize the proximity effect after exposure. Then, SEM was used to measure the processed metalens structure, and FDTD software was used to build a model based on the metalens, simulating and analyzing its focusing characteristics. The results show that the size deviation produced during the processing has little effect on the functionality of the metalens. The processed metalens can also focus different polarized light incidences at different spatial positions: The metalens can focus at 4.97 μm for x-polarized light and focus at 13.5 μm for y-polarized light. Additionally, the metalens has good focusing effects with different working wavelengths. We believe that the processing method of metalens proposed in this paper provides guidance for the preparation of subwavelength metasurface structures, and our findings are beneficial in developing new methods of near-infrared regime manipulation.

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“…Metamaterials are arti cial engineered structures that can perform unique features because of interaction with electromagnetic waves [1]. These unusual properties such as negative refractive index [2], perfect absorption [3], and targeted camou age [4] have attracted tremendous interest into the eld [5] and many studies have been done since the pioneering work was published [6].…”

Section: Introductionmentioning

confidence: 99%

Thermally Tunable Infrared Metalens Using Phase Change Material

Buhara

Ghobadi

Özbay

2022

Preprint

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Metamaterials and their two-dimensional forms, metasurfaces, have been studied intensively due to their unique features that usually do not exist in nature. Due to their unusual properties, they have found their way into many different application areas. One of these application areas is metalens application, where the metasurfaces are formed as flat lenses and they bend the wavefront of the outgoing electromagnetic wave. Metalenses are a candidate to replace the spherical lenses because they are much smaller, they are easy to fabricate, and they are a solution to aberration problems. In this paper, a metalens structure with \(11 \mu\)m operating wavelength is studied. In addition to working at the long infrared wavelength, the dynamic feature is brought to the metalens with the addition of vanadium dioxide, and power control at the focal point is obtained.

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Graphene ribbon based tunable terahertz metalens for dual polarization incidences

Cited by 15 publications

References 25 publications

Dispersion Theory of Surface Plasmon Polaritons on Bilayer Graphene Metasurfaces

Dispersion Theory of Surface Plasmon Polaritons on Bilayer Graphene Metasurfaces

Research on Fabrication Techniques and Focusing Characteristics of Metalens

Thermally Tunable Infrared Metalens Using Phase Change Material

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