Plasmonic Terahertz Amplification in Graphene-Based Asymmetric Hyperbolic Metamaterial

Nefedov, Igor S.; Melnikov, Leonid A.

doi:10.3390/photonics2020594

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…From Fig. 2 one can see that the defect layer shows hyperbolic dispersion at certain frequencies in which the real part of ϵ 0 ‖ is negative, while ϵ 0 ⊥ has a positive real part [32,40]. So, the defect layer of our structure may be regarded as a GHMM.…”

Section: Resultsmentioning

confidence: 86%

Optical properties of a one-dimensional photonic crystal containing a graphene-based hyperbolic metamaterial defect layer

2017

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The transmission properties of a one-dimensional defective photonic crystal have been investigated using the transfer matrix method. A layer of graphene-based hyperbolic metamaterial whose optical axis is tilted with respect to the interface is taken as a defect. It is shown that two kinds of the defect modes can be found in the band gaps of the structure for TM-polarized waves. One kind is created at the frequency range in which the principle elements of the effective permittivity tensor of the defect layer have the same signs. The frequency of this kind of defect mode is independent from the orientation of the optical axis of the defect layer. The other one is created at the hyperbolic dispersion frequency range. Such a defect mode appears due to the anisotropic behavior of the defect layer and its frequency strongly depends on the orientation of the optical axis. Unlike the conventional defect modes, the magnetic field of this defect mode is localized around the defect layer.

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Section: Resultsmentioning

confidence: 86%

Optical properties of a one-dimensional photonic crystal containing a graphene-based hyperbolic metamaterial defect layer

2017

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“…Surface plasmons can be excited in the terahertz (THz) frequency range [5,6] due to the zero bandgap and the high mobility of charge carriers in graphene at room temperature [7]. The plasmons in graphene can be used for the detection [8,9], conversion [10] and amplification [11,12] of THz radiation. Doped graphene exhibits inductive conductivity at THz frequencies and supports the propagation of transverse magnetic (TM) surface plasmons [13,14].…”

Section: Introductionmentioning

confidence: 99%

Terahertz amplification and lasing by using transverse electric modes in a two-layer-graphene-dielectric waveguide structure with direct current

Moiseenko

Popov

Fateev

2023

J. Phys.: Condens. Matter

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We study for the first time the interaction between the waveguide modes of graphene structure and freely propagating terahertz electromagnetic waves (this interaction takes place within the light cone). We revealed a new and rather unexpected physical phenomenon by showing that freely incident terahertz electromagnetic waves can resonate with the surface transverse electric (TE) modes of the graphene waveguide in virtue of these modes having their dispersions in the vicinity of the light cone. The dispersion and amplification of surface TE modes in a dielectric waveguide covered with two graphene layers biased by direct current (DC), as well the amplification and lasing of incident terahertz (THz) wave by excitation of TE mode resonances, is investigated. The DC flows perpendicular to the direction of the surface wave propagation and creates the capacitive conductance of graphene at THz frequencies, which is necessary for the existence of surface TE modes in graphene. The real part of graphene conductivity can be negative at THz frequencies due to DC in graphene which leads to amplification and lasing of THz radiation. Such structure can be of great practical importance because an external terahertz wave can be amplified or generated in lasing process without using special coupling elements commonly needed for ensuring the interaction between external terahertz wave and surface waveguide modes. The use of a two-layer graphene structure makes it possible to reduce the charge-carrier drift velocity required for reaching the lasing threshold at those resonances, as compared to a structure with a single graphene layer.

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“…A novel type of PCs is composed of sequential stacks of alternating graphene and dielectric layers which are well-known as one-dimensional graphene photonic crystals (1D GPCs) and have been utilized in many applications such as isolators [24], biosensors [25], modulators [26], faraday rotators [27], and temperature sensors [28]. On the other hand, anisotropy, which is an interesting feature of graphene, results in remarkable optical properties for GPCs [29]- [31]. The complex band structure of the 1D anisotropic graphene photonic crystal (AGPC) has been obtained in [32] by using the transfer matrix method (TMM).…”

Section: Introductionmentioning

confidence: 99%

Tunable Terahertz Perfect Absorber and Polarizer Based on one-Dimensional Anisotropic Graphene Photonic Crystal

2022

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In this article, a new tunable absorber and polarizer using one-dimensional anisotropic graphene photonic crystal (1D AGPC) is proposed for terahertz applications. The optical properties of the 1D AGPC structure is obtained through the transfer matrix method (TMM) calculations. In our design, a single defect layer is introduced in the 1D AGPC structure to increase its absorption. The absorption coefficient is further modified by optimizing the AGPC parameters such as the number of photonic crystal periods, the defect layer thickness, and the chemical potential of graphene. The modified structure can provide perfect absorption with a narrow bandwidth of 0.05 THz. On the other hand, considering the anisotropic optical properties of graphene, polarization dependence of the absorption coefficient is investigated. This feature of the structure can be employed to realize a tunable terahertz polarizer by adjusting incident angle at θ 0 = 80°. In this way, high tunable polarization extinction ratio of 6.1 dB to 11.63 dB with respectively very narrow bandwidth of 0.031 THz to 0.023 THz are obtained. The maximum insertion losses within the tunable frequency range are as low as 0.023 dB and 0.031 dB. Hence, our design may have potential applications in narrow-band optoelectronic devices at the terahertz frequency range.

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Plasmonic Terahertz Amplification in Graphene-Based Asymmetric Hyperbolic Metamaterial

Cited by 13 publications

References 20 publications

Optical properties of a one-dimensional photonic crystal containing a graphene-based hyperbolic metamaterial defect layer

Optical properties of a one-dimensional photonic crystal containing a graphene-based hyperbolic metamaterial defect layer

Terahertz amplification and lasing by using transverse electric modes in a two-layer-graphene-dielectric waveguide structure with direct current

Tunable Terahertz Perfect Absorber and Polarizer Based on one-Dimensional Anisotropic Graphene Photonic Crystal

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