Fluorination as Effective Method for Tuning the Electromagnetic Response of Graphene

Valynets, N.; Paddubskaya, A.; Kuzhir, P.; Sysoev, Vitalii I.; Bulusheva, L. G.; Окотруб, А. В.

doi:10.1002/pssb.201700226

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…a highly stable graphene nanosheet in which a certain amount of C atoms is covalently bonded to F atoms, [20] is one of the most studied chemically functionalized derivatives of Gr. Fluorination signicantly tailors the electronic and optical properties of Gr towards either a high-quality insulator [21] with a wide bandgap of up to 3 eV [19] or semi-metal with AC conductivity at 600 GHz up to 90 × 10 3 S•m −1 [22]. The later can change by several orders of magnitude with fluorine content [23].…”

Section: Introductionmentioning

confidence: 99%

Fluorinated graphene grating metasurface for terahertz dark state excitation

Valynets¹,

Paddubskaya²,

Sysoev³

et al. 2023

Nanotechnology

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We propose an original technique for the grating metasurfaces fabrication by low-power ultraviolet (UV) laser treatment of fluorinated graphene (FG) films with the focus on terahertz applications. The laser treatment reduces dielectric FG to its conductive counterparts, increasing DC conductivity to 170 S·m-1 for treated areas. The electromagnetic (EM) response of the grating metasurfaces studied by THz time-domain spectroscopy in the 100 GHz – 1 THz frequency range demonstrates enhanced resonant transmittance through metasurfaces. The intensity and position of transmittance peak could be tuned by changing the metasurface geometry, i.e. the period of the structure and width of the reduced and unreduced areas. In particular, the decrease of the reduced FG area width from 400 µm to 170 µm leads to the shift of the resonance peak from 0.45 THz to the higher frequencies, 0.85 THz. Theoretical description based on the multipole theory supported by finite element numerical calculations confirms the excitation of the dark state in the metasurface unit cells comprising reduced and unreduced FG areas at resonance frequency determined by the structure geometrical features. Fabricated metasurfaces have been proved to be efficient narrowband polarizers being rotated by 50◦ about the incident THz field vector.

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Section: Introductionmentioning

confidence: 99%

Fluorinated graphene grating metasurface for terahertz dark state excitation

Valynets¹,

Paddubskaya²,

Sysoev³

et al. 2023

Nanotechnology

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show abstract

“…Among different potential applications the works presented in this Special Issue demonstrate the abilities of graphene and carbon nanotubes for diode and transistor structures, solar cells, and electromagnetic radiation absorbers . Composites containing nanocarbons are efficiently used for different purposes .…”

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confidence: 99%

“…The productive discussions during the meeting (which has been held on 19–24 March 2017) were provided by perfect organization and nice natural environment, including ski slopes, at Krasnaya Polyana resort (Sochi, Russia). The contributions (in total an amount of 30) of this Special Issue are covering research work related to production, characterization and application of the nanocarbon materials which include diamonds, carbon nanotubes, graphene other types of nanocarbon materials, and their composites . Traditionally for the NPO Workshop series there is also some portion of reports devoted to non‐carbon materials demonstrating properties and phenomena analogous to those observed for nanocarbons.…”

mentioning

confidence: 99%