Magneto-optical responses of microcavity-integrated graphene photonic crystals in the infrared spectral region

Ridge gap waveguide is one of the new technologies in the field of waveguides. Their advantages include being planar, low cost of construction, shielding by metal without the need for problems related to packaging, the formation of a narrow gap enclosed between two metal plates, realization of the texture on one of the metal plates and lower losses. These structures have no mechanical connection. While electric currents must flow in them. In this article, two graphene-based ridge gap waveguide coupler structures are presented. The designed structures are used in the THz band. By using graphene in the THz frequency band, frequency reconfigurable can be achieved. S-parameters curves, phase difference diagrams and e-field distributions are reported for two graphene-based ridge gap waveguide couplers.

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“…While (-e) shows electron charge. Fermi-Dirac distribution is presented like this [51][52][53][54][55][56][57][58][59][60][61]:…”

Section: Graphene Conductivitymentioning

confidence: 99%

Implementation of a Graphene-Based RGW Coupler for THz Applications

Kiani

Hamedani

Rezaei

2023

Preprint

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“…[ 157 ] Besides that, graphene is an inherently magneto‐optical material with strong Faraday rotation. [ 158 ] Its response relies on the growth conditions that will inherit the quantum features of Dirac fermions in a magnetic field. [ 159 ] Earlier in 2011, Crassee et al.…”

Section: Magneto‐optic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

“…The results can be further leveraged in graphene‐based photonic device designs and magneto‐optical integrated elements. [ 158 ] By exploring the synergistic properties with magnetic and plasmonic coupling, Lee and Lee prepared magnetoplasmonic graphene decorated with gold nanoparticles and magnetic nanoparticles as a 2D magneto‐optical active material. The magnetic spin from the magnetic nanoparticles and electron spin from the Au nanoparticles on a graphene sheet led to the exhibition of superparamagnetic behavior in magnetoplasmonic graphene at room temperature and strong magneto‐optic activity.…”

Section: Magneto‐optic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

“…[157] Besides that, graphene is an inherently magneto-optical material with strong Faraday rotation. [158] Its response relies on the growth conditions that will inherit the quantum features of Dirac fermions in a magnetic field. [159] Earlier in 2011, Crassee et al experimentally demonstrated that single-layer graphene turned the polarization by a few degrees in modest magnetic fields, contributed by the resonances deriving from the cyclotron effect in the classical regime and the inter-Landau-level transitions in the quantum regime.…”

Section: D Materials With Magneto-optic Effectmentioning

confidence: 99%

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Tunable Optical Properties of 2D Materials and Their Applications

Ren

et al. 2020

Advanced Optical Materials

154

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unlimited possibilities in the improvement of the performances of optoelectronic devices. [19-23] Beyond that, the properties of 2D materials can be tuned in situ by using different approaches [24-26] to expand the functionalities of optoelectronic devices. Out of them, the tunability in their optical properties has attracted great interest over the past decades where researchers dedicated to discovering various tuning methods to realize desired outcomes. [27,28] More excitingly, owing to the unprecedented electronic properties, high stretchability, magnetism, and thermal conductivity of 2D materials, different tuning approaches such as electrical gating, external strain stimuli, a static magnetic field, surface acoustic waves (SAWs), and thermal heating can be simultaneously adopted to participate the light-matter interaction, leading to the tailored and synergetic optical response of 2D materials. [29] Table 1 illustrates a brief advantages and weaknesses analysis between different optical tuning approaches of 2D and non-2D materials. There is a huge potential to revolutionize the optoelectronic devices by incorporating 2D materials with tunable optical properties. [30,31] So far, researchers have achieved flagship milestones in this area where a diverse set of high-performance optical devices are realized including modulators, photodetectors, optical sources, and optical switches. [32] In this review, we primarily focus on the theoretical and experimental researches of optical effects causing by various external stimuli in 2D materials. In Section 2, 2D materials with electro-optic effect and its application will be discussed, followed by piezophototronic effect and its application in Section 3. In Section 4, 2D materials with magneto-optic effect and its application will be discussed. Then, acousto-optic (AO) effect and its application, and thermo-optic (TO) effect and its application will be discussed in Sections 4 and 5, respectively. In the last section, the conclusion and perspective will be provided. 2. Electro-Optic Effect and Its Applications for 2D Materials 2.1. 2D Materials with Electro-Optic Effect In a broad sense, electro-optic effect is about an optical property change in the materials when applying an electric field. As shown in Figure 1, the refractive index of the material can be tuned in the presence of electric field due to the variation of charge carrier density. [29] This effect involves several Recent efforts have been heavily devoted to the development of next-generation optoelectronic devices based on 2D materials, due to their unique optical properties that are distinctly different from those of bulk counterparts. Given that the feature of flexible tunability is highly desired, various approaches have been demonstrated to efficiently modulate the optical properties, eventually enabling peculiar functionalities or realizing high-performance nanoscale devices. Here, this review focuses on recent advances in tuning the optical properties of 2D materials by external stimuli including elec...

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“…We know that the MO performance of monolayer graphene can be improved by using the optical cavity structure or distributed Bragg reflector [28][29][30]. By the same token, the optical cavity has been proposed to enhance the FR angle of monolayer MX 2 with the MEF, which, however, evidences the typical tradeoff between the enhanced FR angle and the decreased transmission [31].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Faraday rotation in proximitized monolayer transition metal dichalcogenides

Dai¹,

Song²,

Da³

2020

Nanotechnology

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Monolayer transition metal dichalcogenides (TMDCs) under the application of a magnetic exchange field carry the nontrivial optical Hall conductivity and thus exhibit the nonzero Faraday rotation (FR) angle. However, the tradeoff between the FR angle and transmission hinders their possible applications in magnetic-optical (MO) devices. Here, we theoretically show that a heterostructure of two photonic crystals with proximitized monolayer TMDCs enables the enhancement of the FR angle and transmission simultaneously through the combination of a four-band Hamiltonian model, Kubo formula and transfer matrix method. The MO improvement in the hybrid structure in both the FR angle and transmission is determined by the combined effects from the localized electromagnetic field at the interface between the two photonic crystals and the satisfaction of the phase match condition. Our work opens up an alternative opportunity to use TMDCs in two-dimensional MO fields in the visible frequency range.

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Magneto-optical responses of microcavity-integrated graphene photonic crystals in the infrared spectral region

Cited by 13 publications

References 35 publications

Implementation of a Graphene-Based RGW Coupler for THz Applications

Implementation of a Graphene-Based RGW Coupler for THz Applications

Tunable Optical Properties of 2D Materials and Their Applications

Enhanced Faraday rotation in proximitized monolayer transition metal dichalcogenides

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