Plasmon-phonon-polariton modes and field enhancement in graphene-coated hexagon boron nitride nanowire pairs

Ye, Shen; Wang, Zixiao; Sun, Chunran; Dong, Changbin; Wei, Buzheng; Wu, Beilei; Jian, Shuisheng

doi:10.1364/oe.26.023854

Cited by 13 publications

(6 citation statements)

References 37 publications

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“…Our results for FOM and the propagation length at the frequency of 45 THz is a significant enhancement, compared to the previous works [104][105][106][107]. For instance, in [104], a quality factor of 33 and a propagation length of 3.2 μm are reported for propagating plasmons on a fabricated graphene-based structure.…”

Section: The Upper Reststrahlen Bandcontrasting

confidence: 40%

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Tunable Plasmon-Phonon Modes in Nonlinear-Graphene-hBN Heterostructures

Heydari

Karimipour

Shirkolaei

2022

Preprint

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In this paper, the analytical expressions are derived for the study of Hybrid Surface Phonon-Plasmon-Polaritons (HSP3) in a nonlinear graphene-based structure with hexagonal Boron Nitride (hBN) layers. The numerical results show that the propagation features of HSP3 can be varied by changing the chemical potential, the relaxation time, and the nonlinear coefficient. Due to the existence of hBN layers in the proposed structure, the investigation is done in two frequency ranges: the upper and lower Reststrahlen bands. The obtained results represent that two kinds of hybrid modes propagate outside the upper and lower Reststrahlen bands which we call “higher and lower modes”. However, only one propagating mode is seen inside the upper or lower Reststrahlen band. A high value of FOM=98 is reported at the frequency of 45 THz (inside the upper Reststrahlen band) for the chemical potential of 0.35 eV. The authors believe that the analytical study done on HSP3 in this paper can help the researchers to design innovative structures such as sensors in the mid-infrared region.

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Section: The Upper Reststrahlen Bandcontrasting

confidence: 40%

“…The authors in [105] have reported the FOM of 25 in a combined graphene-hBN structure. In [106], a FOM of 45 is achieved for the first mode of graphenecoated hBN nanowires at the frequency of 44.8 THz.…”

Section: The Upper Reststrahlen Bandmentioning

confidence: 99%

Tunable Plasmon-Phonon Modes in Nonlinear-Graphene-hBN Heterostructures

Heydari

Karimipour

Shirkolaei

2022

Preprint

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“…A high value of FOM=190 is observable for 𝜇𝜇 𝑐𝑐 = 0.85 𝑒𝑒𝑒𝑒 at the frequency of 48.3 THz. Compared to the previous articles [90][91][92][93], our achieved FOM shows a remarkable increment. In [90], a fabricated graphene-based waveguide is investigated with a reported FOM of 33.…”

Section: Resultsmentioning

confidence: 50%

“…In [90], a fabricated graphene-based waveguide is investigated with a reported FOM of 33. In [91], a quality factor of 25 is obtained for a hybrid graphene-hBN heterostructure and the authors in [92] have reported FOM=45 for their graphene-based nano-wire. One of the important layers in our proposed device in which its parameters can change the performance is the middle substrate, which is primarily supposed to be a SiO 2 layer with a thickness of 𝑑𝑑 = 20𝑐𝑐𝑚𝑚.…”

Section: Resultsmentioning

confidence: 99%

Strong Phonon-Plasmon Coupling in Grounded Graphene-Hexagonal Boron Nitride (hBN) Heterostructures

Heydari

Karimipour

Shirkolaei

2022

Preprint

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In this paper, an analytical model is proposed for a new graphene-based hexagonal Boron Nitride (hBN) heterostructure supporting tunable surface phonon-plasmon polaritons (SP3). The model is started with Maxwell’s equations and then applies boundary conditions. An exact dispersion relation is derived for the proposed structure in which the comparison between simulation and analytical results confirms its validity. A high value of FOM = 190 is reported for the chemical potential of 0.85 eV at the frequency of 48.3 THz. To further show the tunability of the structure, the influence of chemical potential and other geometrical parameters on the quality of propagating SP3 are investigated in detail. The authors believe that the presented study can be useful for the design of novel graphene-based devices in the THz region.

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“…On this basis, parallel SPWs can be constructed. [27][28][29] The nested surface plasmon waveguide coated with graphene is a research hotspot. In 2015, Yang et al designed a circular dielectric nanowire waveguide coated with two layers of graphene, [13] which can be regarded as a coaxial waveguide formed by embedding one graphene-coated dielectric nanowire into the axis of the other.…”

Section: Introductionmentioning

confidence: 99%

Mode characteristics of nested eccentric waveguides constructed by two cylindrical nanowires coated with graphene

Ji¹,

Yu²,

Xue³

2022

Chinese Phys. B

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A kind of nested eccentric waveguide constructed with two cylindrical nanowires coated with graphene was designed. The mode characteristics of this waveguide were studied using the multipole method. It was found that the three lowest modes (mode 0, mode 1 and mode 2) can be combined by the zero-order mode or/and the first-order modes of two single nanowires. Mode 0 has a higher figure of merit and the best performance among these modes within the parameter range of interest. The mode characteristics can be adjusted by changing the parameters of the waveguide. For example, the propagation length will be increased when the operating wavelength, the minimum spacing between the inner and outer cylinders, the inner cylinder radius and the Fermi energy are increased. However, when the outer cylinder radius, the dielectric constants of region I, or the dielectric constants of region III are increased, the opposite effect can be seen. These results are consistent with the results obtained using the finite element method (FEM). The waveguide structure designed in this paper is easy to fabricate and can be applied to the field of micro/nano sensing.

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Plasmon-phonon-polariton modes and field enhancement in graphene-coated hexagon boron nitride nanowire pairs

Cited by 13 publications

References 37 publications

Tunable Plasmon-Phonon Modes in Nonlinear-Graphene-hBN Heterostructures

Tunable Plasmon-Phonon Modes in Nonlinear-Graphene-hBN Heterostructures

Strong Phonon-Plasmon Coupling in Grounded Graphene-Hexagonal Boron Nitride (hBN) Heterostructures

Mode characteristics of nested eccentric waveguides constructed by two cylindrical nanowires coated with graphene

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