Wideband circular polarization converter based on graphene metasurface at terahertz frequencies

Wang, Chongyun; Chen, Ming; Liu, Houquan; Teng, Chuanxin; Deng, Hongchang; Yuan, Libo

doi:10.1117/1.oe.58.4.043106

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…19 The InSb patches were taken to be 405-nm thick and the momentum relaxation time τ gr of graphene as 2 ps. 33,34 Figure 4 demonstrates thermal control of the stopband filter. Spectrums of the co-polarized transmittances T xx (for E inc x) and T yy (for E inc ŷ) shown contain a low-frequency stopband and a high-frequency stopband.…”

Section: Tricontrollable Stopband Filtermentioning

confidence: 99%

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Progress towards bioinspired multicontrollable and multifunctional metasurfaces

Kumar

Lakhtakia

Jain

et al. 2021

Bioinspiration, Biomimetics, and Bioreplication XI

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We have designed multicontrollable and multifunctional metasurfaces comprising pixelated meta-atoms. Optimal tricontrollable metasurfaces comprising graphene-patched pixels for electrical control and InSb-patched pixels for thermal and magnetic control were designed to function either as terahertz absorbers or terahertz stopband filters. Clearly, these devices can also serve as trifunctional sensors. A single-pixel graphene-sandwich metaatom was designed to function as a reciprocal switch, a stopband, a frequency shifter, and an isolator for the terahertz spectral regime. Such multicontrollable and multifunctional metasurfaces could be incorporated in diverse products, thereby reducing inventory costs, enhancing repairability and product lifetimes, and promoting standardization.

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Section: Tricontrollable Stopband Filtermentioning

confidence: 99%

“…The momentum relaxation time τ gr of graphene were taken as 2 ps. 33,34 Symmetry dictates that the co-polarized transmittances are equal, i.e., T xx = T yy .…”

Section: Trifunctional Metasurfacementioning

confidence: 99%

Progress towards bioinspired multicontrollable and multifunctional metasurfaces

Kumar

Lakhtakia

Jain

et al. 2021

Bioinspiration, Biomimetics, and Bioreplication XI

View full text Add to dashboard Cite

show abstract

“…Reversal of the sign of E o does not change the surface conductivity of graphene [34]. We fixed the momentum relaxation time τ gr of graphene as 2 ps [39,40] and varied…”

Section: Graphenementioning

confidence: 99%

Tricontrollable pixelated metasurface for stopband for terahertz radiation

Kumar

Lakhtakia

Jain

2020

Journal of Electromagnetic Waves and Applications

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Transmission of a normally incident plane wave through a pixelated metasurface with meta-atoms made up of graphene-patched and InSb-patched pixels on a silicon substrate was simulated using CST Microwave Studio TM 2019 software. This metasurface is electrically controllable due to the graphene-patched pixels, and it is magnetically as well as thermally controllable due to the InSbpatched pixels. A tricontrollable stopband with minimum transmittance as low as 0.05 can be achieved for operation in the terahertz gap.

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“…2,3 According to recent studies, one of the critical solutions to solve this problem is to share a wideband LP antenna with a wideband LP-to-CP converter (or CP polarizer). [4][5][6] Therefore, for a single-band CP, a wide bandwidth is made available by a variety of single-wideband CP polarizers, [7][8][9][10][11][12][13][14] and a new problem appears when the goal is to support two wide CP bands, which is the current requirement of many advanced systems. 15 Indeed, a dual-band CP antenna without polarizer has a very limited bandwidth and a complex feed structure.…”

Section: Introductionmentioning

confidence: 99%

Dual wideband high‐efficient reflective linear‐to‐dual‐circular dual‐rotational polarization converter with two complementary twin‐split square‐ring resonators

Zaker

2024

Int J Communication

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SummaryA high‐efficient linear‐to‐circular polarization (LP‐to‐CP) converter with dual‐band, dual‐rotational‐direction reflectivity using a single‐layer selective surface (FSS) with a thickness of at 3.5 GHz is designed and investigated. The unit cell, measuring 8 mm × 8 mm ( at 3.5 GHz), consists of two dual‐slotted square rings, with the outer ring providing two nonadjacent CP bands with two reflective resonances in each. The inner ring, with a 90° rotation and the ability to create different polarization and phase behavior, obtains two wide bands with high CP quality. Parametric studies and optimal results show an interesting fact that incident x(y)‐direction LP wave is effectively converted into right‐hand CP, that is, RHCP (left‐hand CP, i.e., LHCP) wave at the former band and into LHCP (RHCP) at the later band. Finally, a practical 10 × 10 optimal array is fabricated which offers excellent axial ratio below 2 dB over two wide bandwidths: 3.46 to 5.96 GHz (53%: S and C bands) and 7.8 to 12.2 GHz (44%: X band). The converter is angularly stable over 45° and 30° in the stated bands, respectively. A good agreement between simulation and measurement and essential comparisons with literature are also proposed. The results demonstrate significant potential for different dual‐band CP applications with simultaneous isolated uplink and downlink.

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Wideband circular polarization converter based on graphene metasurface at terahertz frequencies

Cited by 8 publications

References 18 publications

Progress towards bioinspired multicontrollable and multifunctional metasurfaces

Progress towards bioinspired multicontrollable and multifunctional metasurfaces

Tricontrollable pixelated metasurface for stopband for terahertz radiation

Dual wideband high‐efficient reflective linear‐to‐dual‐circular dual‐rotational polarization converter with two complementary twin‐split square‐ring resonators

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