Active control of terahertz amplitude and phase based on graphene metasurface

Gong, Yumin; Quan, Baogang; Hu, Fangrong; Wang, Hong; Zhang, Longhui; Jiang, Mingzhu; Zeng, Lang; Zhang, Xiaowen; Xu, Weilin

doi:10.1016/j.physe.2022.115334

Cited by 13 publications

(5 citation statements)

References 57 publications

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“…phase shift as much as 176 degrees can be observed at about 0.423 THz. And in the frequency range from 407 to 435 GHz, the phase shift is greater than 170 degrees, which is bigger than the results in many other reported works [23][24][25]36].…”

Section: Resultscontrasting

confidence: 62%

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Large dynamic range terahertz phase modulator based on graphene-metal hybrid metasurface

Wang

et al. 2023

Phys. Scr.

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Terahertz (THz) dynamic phase modulator is indispensable in THz wireless communications, high-resolution imaging and radar systems. However, up to now, it is difficult to achieve dynamic tunable phase shift of more than 150 degrees in single-layer transmission mode. In this work, we proposed a THz dynamic large phase modulator based on graphene-metal hybrid metasurface. The simulation results show that, when the Fermi level of graphene changes from 0 eV to 0.86 eV, the phase shift exceeds 176 degrees. By modifying the structural parameters, a phase shift of 170 degrees can be achieved in a bandwidth of 50 GHz. We investigated the physical mechanism of the dynamic phase modulator, and established the relationship between phase shift and Fermi level theoretically. This study paves a new way for realizing dynamic large phase modulation, which is very important for the THz broadband wireless communication, high-resolution imaging and radar system.

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Section: Resultscontrasting

confidence: 62%

“…AzimBeik et al used a graphene nanoribbon structure design methodology of 90 degrees phase shifter [35]. Gong et al [36] proposed a bifunctional modulator based on graphene metasurface and 90 degrees phase shift was achieved under external electrical trigger.…”

Section: Introductionmentioning

confidence: 99%

Large dynamic range terahertz phase modulator based on graphene-metal hybrid metasurface

Wang

et al. 2023

Phys. Scr.

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“…Consequently, the multi-functional modulator with amplitude and phase modulation is a promising approach to avoid redundant designs and reduce processing costs [28][29][30][31]. However, current research results are still unfavorable, due to issues such as bulky, high transmission loss, and limited phase shift range [32]. Furthermore, integrating these multifunctional devices into terahertz systems presents challenges since they are not on-chip components.…”

Section: Introductionmentioning

confidence: 99%

Low terahertz frequency on-chip multi-functional modulator with amplitude and phase modulation

Liang,

Zeng,

Zhao

et al. 2023

J. Phys. D: Appl. Phys.

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Terahertz amplitude and phase modulation technologies are crucial for terahertz communication, radar, and imaging. However, most current approaches can only achieve either amplitude or phase modulation. In this paper, we present a low terahertz frequency on-chip multi-functional modulator that consists of a hybrid coupler and reflection meta-structure. High-performance amplitude modulation is achieved by combining series resonant absorption of series coupling branch (SCB) with resonance enhancement of parallel coupling branch (PCB) in the reflection meta-structure. Meanwhile, the enhanced resonance provides a larger range of phase shifts, enabling effective amplitude and phase modulation in two different frequency regions. Therefore, we realize an amplitude modulation in the range of 115-135 GHz with a minimum transmission loss of 4 dB and a modulation depth of over 10 dB. At the same time, we achieved a continuous phase shift in the 103-113 GHz region, as well as a 180-degree 2-bit phase shift in the 107-109 GHz range with only 5.7 dB transmission loss. Our simple method for terahertz amplitude and phase multi-functional modulation offers the potential to construe terahertz multifunctional integrated systems.

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“…Moreover, the conductivity of graphene is defined by the formula σ = j e 2 μ normalc π ℏ 2 ( ω + j τ − 1 ) where ω is the radian frequency, e represents the electron charge, ℏ represents the reduced Planck constant, τ represents the electron–phonon relaxation time which is set as 0.1 ps, and μ c represents the chemical potential which is tuned from 0 to 1 eV, which is equal to the Fermi level E F . The thickness of the graphene is set as 1 nm …”

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confidence: 99%

“…The thickness of the graphene is set as 1 nm. 37 To illustrate the field enhancement behavior of the device, the simulated transmission spectra are shown in Figure 2a. As E F is located at 0 eV, the transmission spectrum is plotted as the black solid line in Figure 2a, indicating that the device has a weak resonance dip.…”

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confidence: 99%

Intervalley Scattering Induced Terahertz Field Enhancement in Graphene Metasurface

Gong,

Quan,

et al. 2023

Nano Lett.

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Active control of terahertz amplitude and phase based on graphene metasurface

Cited by 13 publications

References 57 publications

Large dynamic range terahertz phase modulator based on graphene-metal hybrid metasurface

Large dynamic range terahertz phase modulator based on graphene-metal hybrid metasurface

Low terahertz frequency on-chip multi-functional modulator with amplitude and phase modulation

Intervalley Scattering Induced Terahertz Field Enhancement in Graphene Metasurface

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