Study of modal properties in graphene-coated nanowires integrated with substrates

Teng, Da; Guo, Jinkang; Yang, Yandie; Ma, Wenshuai; Wang, Kai

doi:10.1007/s00340-020-07525-1

Cited by 8 publications

(4 citation statements)

References 58 publications

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“…In 2017, Bezares et al presented FeCl 3 -intrcalated graphene as a new plasmonic material with high stability under environmental conditions and carrier concentrations, corresponding to a Fermi energy of 1.21 eV on the two-monolayer sample and 1.4 eV for the bilayer graphene [33]. By use of the electrolyte gate technique, for example, carrier densities as high as n = 4 × 10 14 cm −2 have been obtained for electrons and holes [34], and the corresponding chemical potential is about 1.17 eV [35]. A reasonable tuning range of the chemical potential can reach 1.2 eV based on the current situation that a carrier density of up to 10 14 cm −2 has been realized in experiments [36,37].…”

Section: Resultsmentioning

confidence: 99%

Realization of Multifunctional Metamaterial Structure Based on the Combination of Vanadium Dioxide and Graphene

et al. 2022

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Combining tunable properties and various functionalities into a single metamaterial structure has become a novel research hotspot and can be used to tackle great challenges. The multifunctional metamaterial structure that combines absorption, linear-to-circular (LTC) polarization conversion, filtering and switching functions into a single metamaterial device was designed and investigated in this study. The switching of different functions can be achieved based on the phase transition of vanadium dioxide (VO2) and change of graphene chemical potential. When VO2 is in a metal state, the multi-frequency absorption and LTC polarization conversion can be achieved with different chemical potentials. When VO2 is in the insulator state and the polarization angle of incident wave is 45°, the device can be used to select or isolate the incident waves with different polarization states in the frequency region of 1.2–1.8 THz. Furthermore, when the chemical potentials are 0.05 eV and 1.2 eV, the corresponding transmissions of the TE-polarized wave demonstrate the opposite results, realizing the switching functions in the frequency region of 0.88–1.34 THz. In the frequency region above 2 THz, the multi-frequency rejection filter can be achieved. The designed switchable multifunctional metamaterial device can be widely implemented in radar monitoring and communication systems.

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Section: Resultsmentioning

confidence: 99%

Realization of Multifunctional Metamaterial Structure Based on the Combination of Vanadium Dioxide and Graphene

et al. 2022

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“…integrated with SiO2 or Si substrates [51][52][53][54][55][56] were presented to demonstrate ultra-compact photonic integrated circuits in the mid-and far-infrared bands.…”

Section: Waveguide Structure and Methodsmentioning

confidence: 99%

“…More importantly, the combination of graphene and silicon-on-insulator (SOI) waveguides make it possible to design graphene-based photonic integration devices [ 32 ], such as waveguides [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ], sensors [ 40 , 41 ], filters [ 42 ], modulators [ 43 , 44 ], etc. Recently, graphene–SiO 2 –Si coaxial-like waveguides [ 45 ], graphene layer–SiO 2 –Si planar structures [ 46 , 47 , 48 , 49 , 50 ], and graphene-coated nanowires integrated with SiO 2 or Si substrates [ 51 , 52 , 53 , 54 , 55 , 56 ] were presented to demonstrate ultra-compact photonic integrated circuits in the mid- and far-infrared bands.…”

Section: Introductionmentioning

confidence: 99%

Symmetric Graphene Dielectric Nanowaveguides as Ultra-Compact Photonic Structures

Teng

Wang

et al. 2021

Nanomaterials

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A symmetric graphene plasmon waveguide (SGPWG) is proposed here to achieve excellent subwavelength waveguiding performance of mid-infrared waves. The modal properties of the fundamental graphene plasmon mode are investigated by use of the finite element method. Due to the naturally rounded tips, the plasmon mode in SGPWG could achieve a normalized mode field area of ~10−5 (or less) and a figure of merit over 400 by tuning the key geometric structure parameters and the chemical potential of graphene. In addition, results show that the modal performance of SGPWG seems to improve over its circular counterparts. Besides the modal properties, crosstalk analysis indicates that the proposed waveguide exhibits extremely low crosstalk, even at a separation distance of 64 nm. Due to these excellent characteristics, the proposed waveguide has promising applications in ultra-compact integrated photonic components and other intriguing nanoscale devices.

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“…Compared with the metallic waveguides, graphene plasmon waveguides could confine the infrared waves into the deep subwavelength scale, and the guided modes could be easily tuned [ 34 ]. Up to now, lots of graphene-based configurations have been proposed to guide the infrared waves, such as graphene ribbons [ 35 ], graphene slot waveguides [ 36 , 37 ], graphene wedge and groove waveguides [ 38 ], dielectric-loaded graphene waveguides [ 39 ], graphene-coated nanowires [ 40 , 41 , 42 , 43 , 44 , 45 , 46 ], graphene-based hybrid waveguides [ 47 , 48 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Teng

Wang

2021

Nanomaterials

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The waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide is investigated based on the effective-index method and the finite element method. Modal properties of the effective mode index, modal loss, and cut-off characteristics of higher order modes are investigated. By modulating the Fermi level, the modal properties of the fundamental mode could be adjusted. The accuracy of the effective-index method is verified by a comparison between the analytical results and numerical simulations. Besides the modal properties, the crosstalk between the adjacent waveguides, which determines the device integration density, is studied. The findings show that the effective-index method is highly valid for analyzing dielectric-loaded graphene plasmon waveguides in the terahertz region and may have potential applications in subwavelength tunable integrated photonic devices.

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Study of modal properties in graphene-coated nanowires integrated with substrates

Cited by 8 publications

References 58 publications

Realization of Multifunctional Metamaterial Structure Based on the Combination of Vanadium Dioxide and Graphene

Realization of Multifunctional Metamaterial Structure Based on the Combination of Vanadium Dioxide and Graphene

Symmetric Graphene Dielectric Nanowaveguides as Ultra-Compact Photonic Structures

Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

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