Electrical tunability of soft parametric resonance by hot electrons in graphene

Sekwao, Samwel; Leburton, Jean Pierre

doi:10.1063/1.4823825

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Graphene, as a stable existed carbon-atom layer with honeycomb structure, has been extensive studied as a hosting materials for supporting the SPs in the past few years, due to its exceptional electronic and photonic properties, for example, intrinsic high carrier’s mobility as well as large electrical tunability. − The SPs have been presented in a variety of periodic structures such as ribbons, − disks, , and crossed shapes, , exhibiting superior performance in the application of biosensor, plasmonic waveguide. Nevertheless, carrier transport in graphene is susceptible to the surface imperfections, making it still a great challenge to satisfy the scalable on-chip optoelectronic application.…”

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confidence: 99%

Active Tuning of Midinfrared Surface Plasmon Resonance and Its Hybridization in Black Phosphorus Sheet Array

et al. 2018

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The behaviors of anisotropic plasmons in black phosphorus have been fully exploited across a complete variety of system including individual nanoribbon, vertically offset paired ones, and nanoribbon/sheet hybrid system. Benefiting from its twodimensional nature, plasmons can be actively controlled by either geometrical parameters or the carrier doping in black phosphorus, which allows for the emerging phenomenon of strong light−matter interaction at mid-infrared region. Remarkably, Rabi splitting over 17.3 meV is observed in the plasmonic spectra of the nanoribbon/ sheet hybrid structure as harnessed by the strong interaction of coupled plasmons. We also propose a scheme that supports plasmon on a continuous monolayer black phosphorus by using a diffraction grating. By adjusting the geometrical parameters of the grating and the Fermi level of the black phosphorus slightly, the resonance wavelength can be changed notably. The results appealing open up possibilities of devising black phosphorusbased plasmons in the application of optical detection and sensing within the deep subwavelength regime at mid-infrared region.

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Active Tuning of Midinfrared Surface Plasmon Resonance and Its Hybridization in Black Phosphorus Sheet Array

et al. 2018

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“…where λ F = ω OP /eF o , and 0 < α ≤ 1. As in a previous work, [17] the dimensionless damping parameter γ given by γ = 1…”

Section: IImentioning

confidence: 98%

“…This important result indicates the potential use of graphene in terahertz sources and detectors. [17,18] In conclusion, we have provided an analysis of carrier dynamics in graphene subjected to periodic, time, and space dependent electric fields and scattering times. Our model shows that, high Q resonances can be achieved when ω = ω F .…”

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Terahertz harmonic generation in graphene

Sekwao

Leburton

2015

Applied Physics Letters

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We show that charge carrier transport in graphene exhibit sharp resonances in the presence of spatially and temporarily modulated scattering. Resonances occur when the period of an applied a-c field corresponds to the time taken by quasi-ballistic carriers to drift over a spatial scattering period, provided the latter is shorter than the distance taken by carriers to emit an optic phonon. We show that such system can be achieved with interdigitated gates energized with an a-c bias on graphene layers. Gate separation and fields to achieve ballistic transport would result in resonances in the terahertz range, with the generation of higher harmonics characterized by large Q-factors, which are tunable with gate spacing.As a one atom thick, two-dimensional (2D) material made up of carbon atoms arranged in a honeycomb structure, [1,2] graphene is characterized by linear dispersion relation between carrier energy and momentum E = v F |k| at K and K symmetry points of the 2D Brillouin zone. As a consequence, all charge carriers in graphene move with the constant Fermi velocity v F ∼ 10 8 cm/s. [3,4] The interaction of these carriers with the 2D environment such as lattice vibrations or oscillatory electro-magnetic fields, is of fundamental interest since it opens a new way to study quantum electrodynamics of charged particles in solid state physics.[5] It may also have important implications in semiconductor technology. [6][7][8] Owing to their large velocity, the weak interaction between charge carriers and acoustic phonons (APs) results in long mean free paths for the former that experience quasi-ballistic motion over distance of the order of several micrometers.[9, 10] At high energy however, carriers lose their momentum (and energy) to efficient optic phonons (OPs) that have much higher vibration frequency ( ω OP ∼ 0.2eV) than in conventional semiconductors.[11] Therefore, in the presence of a constant electric field F o , the carrier motion results in a succession of quasi-ballistic acceleration (when their energy E < ω OP ) and scattering (when their energy is E ≥ ω OP ).[12] This stop-and-go motion of carriers can occur over long distances during picosecond flight times.[13] An interesting effect could arise if the carriers are placed in periodic long range and time varying scattering to achieve transport resonance as well as possible frequency mixing. This kind of situation could be realized in free standing graphene sheets lying over periodically spaced narrow electric gates that would be regulated by an a-c field of appropriate frequency to modulate coulomb scattering of remote oxide impurities when carriers pass in front of the gates (Fig. 1). In the device, a DC field F o is set up between the source S and the drain D, and the a-c field F 1 is applied between successive gates, so that charge carriers experience periodic electric fields and scattering times varying in time and distance along the channel.

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Active tuning of the hybridization effects of mid-infrared surface plasmon resonance in a black phosphorus sheet array and a metal grating slit

Huang

Liu

Fang

et al. 2019

Opt. Mater. Express

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In this paper, the absorption characteristics of a hybrid structure composed of a black phosphorus (BP) nanostrip array based on localized surface plasmon resonance (LSPR) and a metal grating slit structure have been analyzed systematically. Firstly, we theoretically investigate light-matter interaction in different dimensions of BP nanostrip arrays along armchair and zigzag direction, revealing the absorption property and anisotropic plasmonic response. Besides, the transmission characteristics of the metal grating slit structure with different geometric dimensions are thoroughly analyzed by the transmission spectra and electric intensity distributions. At last, by combining the two structures, we increased the absorption of BP from 72% to 83.6% at 7.04 µm, and this hybrid BP structure demonstrates high absorption at mid-infrared wavelength regime, predicting a promising future for the directional dependent plasmonic devices based on two-dimensional (2D) materials.

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Electrical tunability of soft parametric resonance by hot electrons in graphene

Cited by 3 publications

References 9 publications

Active Tuning of Midinfrared Surface Plasmon Resonance and Its Hybridization in Black Phosphorus Sheet Array

Active Tuning of Midinfrared Surface Plasmon Resonance and Its Hybridization in Black Phosphorus Sheet Array

Terahertz harmonic generation in graphene

Active tuning of the hybridization effects of mid-infrared surface plasmon resonance in a black phosphorus sheet array and a metal grating slit

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