A plasmon modulator by dynamically controlling the spatial distribution of carrier density in graphene

Hu, Xuefang; Zhao, Xiangyue; Gu, Yinwei; Jin, Shu-Ping; Shafqat, Hussain; Cui, Yiping; Lü, Changgui

doi:10.1016/j.optcom.2022.128093

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…( 2 ), where , V f and n g are the reduced Planck constant, Fermi velocity and carrier density respectively, where V f ≈ 10 6 m/s 27 – 29 . Herein, the Fermi level of the graphene can be modulated by the voltage effectively and dynamically 30 , 31 . …”

Section: Model and Analysismentioning

confidence: 99%

A multi-parameter tunable plasmon modulator

Lü

Zhao

et al. 2023

Sci Rep

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Multi-parameter control of light is a key functionality to modulate optical signals in photonic integrated circuits for various applications. However, the traditional optical modulators can only control one or two properties of light at the same time. Herein, we propose a hybrid structure which can modulate the amplitude, wavelength and phase of surface plasmon polaritons (SPPs) simultaneously to overcome these limitations. The numerical results show that when the Fermi level of graphene changes from 0.3 to 0.9 eV, the variation of optical transmission, wavelength and phase are 32.7 dB, 428 nm and 306°, respectively. The demonstrated structure triggers an approach for the realization of ultracompact modulation and has potential applications in the fields of optical switches, communications and photo-detection.

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Section: Model and Analysismentioning

confidence: 99%

A multi-parameter tunable plasmon modulator

Lü

Zhao

et al. 2023

Sci Rep

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“…Since its imaginary part of complex conductivity is positive as it is doped by electrostatic or chemical doping techniques [2][3][4][5], tunable graphene surface plasmons (GSPs) are supported on graphene structures in the mid-infrared/THz frequency range [6]. Due to its strong field confinement and unique tunability, GSPs have attracted tremendous investigation and found various novel optical applications, including efficient mid-infrared/THz sources [7][8], modulators [9][10], broadband polarizer [11], plasmonic components [12][13], and optoelectronic components, such as photodetectors [14], etc.…”

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confidence: 99%

Directional excitation of acoustic graphene plasmons using oblique incidences

Sun

Xie

ZHOU

et al. 2023

Preprint

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In this work, the directional excitation of acoustic graphene plasmons (AGPs) are numerically studied using Finite Element Methods. In our proposed hybrid graphene-metal structure under oblique incidences, not only are AGPs excited efficiently, but also they are unidirectional propagating along a graphene monolayer. Although the symmetry AGPs dispersion relations are broken by oblique incidence, both left and right moved AGPs are excited simultaneously at a resonant wavelength due to almost equaled wavenumbers of directional propagated AGPs. Based on the fact that great AGPs excitation efficiency can’t guarantee high EM energy propagating in one direction, we will focus on how the directional propagating net energy are affected by geometrical parameters. Due to the tunable graphene conductivity, AGPs propagation with great unidirectional net energy can be dynamically controlled by a relatively low externally applied bias voltage (electrostatic gating). The prototype structure may find applications in ultra-confined plasmons launchers and switchers in integrated optics.

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