Tunable Terahertz Plasmons in Graphite Thin Films

Xing, Qinghe; Song, Chaoyu; Wang, Chong; Xie, Yongjun; Huang, Shenyang; Wang, Fanjie; Lei, Yuchen; Yuan, Xiang; Zhang, Cheng; Mu, Lina; Huang, Yuan; Xiu, Faxian; Yan, Hugen

doi:10.1103/physrevlett.126.147401

Cited by 6 publications

(5 citation statements)

References 60 publications

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“…A recent theoretical study by Kavokine et al has sought to explain the differences in friction at graphene vs graphite by accounting for coupling between collective charge excitations of the liquid and the dynamics of electrons in the carbon substrate. In this framework of “quantum friction” (QF), friction of water on graphite is argued to be larger than that on graphene due to the presence of a dispersionless surface plasmon mode in graphite − that overlaps with liquid water’s terahertz (THz) dielectric fluctuations. − The purpose of the present article is to explore QF with molecular simulations.…”

Section: Model Of the Liquid–solid Interfacementioning

confidence: 99%

Classical Quantum Friction at Water–Carbon Interfaces

et al. 2023

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Friction at water−carbon interfaces remains a major puzzle with theories and simulations unable to explain experimental trends in nanoscale waterflow. A recent theoretical framework�quantum friction (QF)�proposes to resolve these experimental observations by considering nonadiabatic coupling between dielectric fluctuations in water and graphitic surfaces.Here, using a classical model that enables fine-tuning of the solid's dielectric spectrum, we provide evidence from simulations in general support of QF. In particular, as features in the solid's dielectric spectrum begin to overlap with water's librational and Debye modes, we find an increase in friction in line with that proposed by QF. At the microscopic level, we find that this contribution to friction manifests more distinctly in the dynamics of the solid's charge density than that of water. Our findings suggest that experimental signatures of QF may be more pronounced in the solid's response rather than liquid water's.

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Section: Model Of the Liquid–solid Interfacementioning

confidence: 99%

Classical Quantum Friction at Water–Carbon Interfaces

et al. 2023

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“…33 Graphite also would be an excellent THz absorber with good shielding effectiveness, small reflection, and better temperature stability. 34,35 In recent years, absorber structures based on graphite resonators have been reported to achieve broadband THz absorption, but they cannot be dynamically tuned. [36][37][38] So far, some multilayer graphene-based structures, 39 multilayer VO 2 -based structures, 40 or multilayer metal/dielectric structures 41 have been designed to achieve tunable ultra-wideband absorption bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“… – 32 Furthermore, its electrochemical potential can be adjusted through electrostatic gating, magnetic field, or optical excitations 33 . Graphite also would be an excellent THz absorber with good shielding effectiveness, small reflection, and better temperature stability 34 , 35 . In recent years, absorber structures based on graphite resonators have been reported to achieve broadband THz absorption, but they cannot be dynamically tuned 36 …”

Section: Introductionmentioning

confidence: 99%

Carbon-based ultrabroadband tunable terahertz metasurface absorber

Nie,

He,

Cao

2024

Adv. Photon. Nexus

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.Carbon-based materials, such as graphene and carbon nanotubes, have emerged as a transformative class of building blocks for state-of-the-art metamaterial devices due to their excellent flexibility, light weight, and tunability. In this work, a tunable carbon-based metal-free terahertz (THz) metasurface with ultrabroadband absorption is proposed, composed of alternating graphite and graphene patterns, where the Fermi level of graphene is adjusted by varying the applied voltage bias to achieve the tunable ultrabroadband absorption characteristics. In particular, when the Fermi level of graphene is 1 eV, the absorption coefficient exceeds 90% from 7.24 through 16.23 THz, and importantly, the absorption bandwidth reaches as much as 8.99 THz. In addition, it is polarization-insensitive to incident waves and maintains a high absorption rate at an incident angle of up to 50 deg. This carbon-based device enjoys higher absorption bandwidth, rates, and performance compared to conventional absorbers in the THz regime and can be potentially applied in various fields, including THz wave sensing, modulation, as well as wearable health care devices, and biomedicine detection.

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“…Despite the growing interest in graphene plasmonics, most GP research has been performed at room temperature, and the temperature dependence of GP properties has not been widely investigated thus far. 23 A notable exception would be the study by Ni et al 24 They examined the fundamental limits of GP damping at cryogenic temperatures through near-field imaging of propagating GPs in a high-quality exfoliated graphene encapsulated by the hexagonal boron nitride (h-BN). However, we note that practical nanophotonic devices require large-area graphene grown by chemical vapor deposition (CVD), whose quality is generally inferior to that of graphene obtained by mechanical exfoliation.…”

Section: ■ Introductionmentioning

confidence: 99%

Temperature-Dependent Plasmonic Response of Graphene Nanoresonators

et al. 2022

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Graphene plasmons have attracted enormous research interest due to their dynamic tunability and the extreme field confinement they provide. However, despite their popularity, most studies revolving around graphene plasmons have been restricted to room temperature, leaving unconsidered important tunability knob. In this work, we experimentally investigate the temperature-dependent plasmonic properties of graphene nanoresonators with varying widths on SiO2 substrate by infrared transmission spectroscopy. As temperature drops from 300 to 100 K, the intensity of the graphene plasmon resonance peak increases up to 76%, and the amount of enhancement decreases with increasing carrier concentration and decreasing resonator width. We attribute the enhancement of graphene plasmon resonance to an additional hole doping of Δp = 1.37 × 1012 cm–2 associated with cooling and reduced plasmon damping due to the suppression of phonon-mediated scattering channels. Our results uncover the significance of temperature effects that can be exploited in graphene-based tunable plasmonic devices operating at low temperatures.

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Tunable Terahertz Plasmons in Graphite Thin Films

Cited by 6 publications

References 60 publications

Classical Quantum Friction at Water–Carbon Interfaces

Classical Quantum Friction at Water–Carbon Interfaces

Carbon-based ultrabroadband tunable terahertz metasurface absorber

Temperature-Dependent Plasmonic Response of Graphene Nanoresonators

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