Graphene aperture-based metalens for dynamic focusing of terahertz waves

Ding, Pei; Li, Yan; Shao, Li; Tian, Ximin; Wang, Junqiao; Fan, Chunzhen

doi:10.1364/oe.26.028038

Cited by 87 publications

(48 citation statements)

References 57 publications

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“…Besides, metasurfaces have been utilized to realize dynamic lenses in response to the demands of varifocal applications [41,[77][78][79][80]. In 2017, Huang et al proposed a graphene-based metasurface lens that can tune the focusing length continually by 1.25λ [78].…”

Section: Active Metasurfaces For Terahertz Manipulation Active Metasumentioning

confidence: 99%

“…The lens-on-MEMS scanner exhibited a stable tunability with an averaged measurement deviation of 0.2%, manifesting a strong practicality. More recently, Ding et al proposed another graphene-based meta-lens to achieve focusing modulation [80]. The metasurface was composed of a graphene layer perforated with rectangular unit cells, a SiO 2 substrate, and a metal ground, as illustrated in Figure 8D.…”

Section: Active Metasurfaces For Terahertz Manipulation Active Metasumentioning

confidence: 99%

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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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Section: Active Metasurfaces For Terahertz Manipulation Active Metasumentioning

confidence: 99%

Section: Active Metasurfaces For Terahertz Manipulation Active Metasumentioning

confidence: 99%

Terahertz Metasurfaces: Toward Multifunctional and Programmable Wave Manipulation

et al. 2020

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“…Metasurfaces have stirred up a spree of research interest in recent years due to their brilliant performance in the field of electromagnetic wave manipulation [1][2][3][4][5][6][7][8][9]. Metasurfaces are based on some well-designed subwavelength scale arrays of resonators to manipulate the amplitude, phase, propagation direction, and polarization of light to nanoscale resolution at an ease [10][11][12][13][14][15][16][17][18][19], making them an appropriate option for miniaturization and integration of photonic systems. Currently, metasurfaces are being applied to various applications, such as metalenses [20], holograms [21,22], cloaking [23,24], surface plasmon launcher [4], nonlinear devices [3,11,[25][26][27][28], bio sensing [26,27], computing [11,28], switching [5,29], and various novel photonic systems and devices [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency, Broadband, Near Diffraction-Limited, Dielectric Metalens in Ultraviolet Spectrum

Kanwal

Wen

et al. 2020

Nanomaterials

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Ultraviolet (UV) optical devices have plenteous applications in the fields of nanofabrication, military, medical, sterilization, and others. Traditional optical components utilize gradual phase accumulation phenomena to alter the wave-front of the light, making them bulky, expensive, and inefficient. A dielectric metasurface could provide an auspicious approach to precisely control the amplitude, phase, and polarization of the incident light by abrupt, discrete phase changing with high efficiency due to low absorption losses. Metalenses, being one of the most attainable applications of metasurfaces, can extremely reduce the size and complexity of the optical systems. We present the design of a high-efficiency transmissive UV metalens operating in a broadband range of UV light (250-400 nm) with outstanding focusing characteristics. The polarization conversion efficiency of the nano-rod unit and the focusing efficiency of the metasurface are optimized to be as high as 96% and 77%, respectively. The off-axis focusing characteristics at different incident angles are also investigated. The designed metalens that is composed of silicon nitride nanorods will significantly uphold the advancement of UV photonic devices and can provide opportunities for the miniaturization and integration of the UV nanophotonics and its applications.

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“…Metasurfaces possess the advantages of small losses and are easy to manufacture [10,11], and have been attractive in recent years. Among various metasurfaces, metalens with its unit cell interacting with incident light and introducing abrupt phase shift along the interface of the metasurface have been widely presented to achieve the function of focusing [12,13] and anomalous reflection [14][15][16]. Lots of models like the nanoslit [17], nanohole [18,19], and graphene ribbons [20][21][22][23][24] have been introduced in metalens design, where 2π phase shift resulting from the designed antennas is needed in controlling the wavefront.…”

Section: Introductionmentioning

confidence: 99%

Polarization Controlled Dual Functional Reflective Planar Metalens in Near Infrared Regime

et al. 2020

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The metalens has been a hotspot in scientific communications in recent years. The polarization-controlled functional metalens is appealing in metalens investigation. We propose a metalens with dual functions that are controlled by polarization states. In the first design, when applied with x-and y-polarized light, two focal spots with different focal lengths are acquired, respectively. The proposed metalens performs well when illuminated with adjacent wavelengths. In the second design, the reflected light is focused when applied with x-polarized light, and when applied with y-polarized light, the reflected light is split into two oblique paths. We believe that the results will provide a new method in light manipulation.

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Graphene aperture-based metalens for dynamic focusing of terahertz waves

Cited by 87 publications

References 57 publications

Terahertz Metasurfaces: Toward Multifunctional and Programmable Wave Manipulation

Terahertz Metasurfaces: Toward Multifunctional and Programmable Wave Manipulation

High-Efficiency, Broadband, Near Diffraction-Limited, Dielectric Metalens in Ultraviolet Spectrum

Polarization Controlled Dual Functional Reflective Planar Metalens in Near Infrared Regime

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