Electromagnetic induced transparency in graphene waveguide structure for Terahertz application

Zhao, Haolan; Ren, Yinshuan; Fang, Liang; Lin, Hai

doi:10.1016/j.rinp.2020.102971

Cited by 18 publications

(9 citation statements)

References 30 publications

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“…Since the shift at a single dielectric surface is quite small, i.e., usually subwavelength scale, much attention has been devoted to enhancing this effect by applying different materials and structures. Up to now, the enhancement has been illustrated using gradient metasurfaces [8], epsilon-near-zero slabs [9], weakly absorbing slabs [10], subwavelength gratings [11], graphene [12][13][14], a coherent medium [15], and a cavity optomechanical system [16].…”

Section: Introductionmentioning

confidence: 99%

Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide

Kan

Zhi²,

Yin

et al. 2022

Materials

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Goos-Hänchen shift provides a way to manipulate the transverse shift of an optical beam with sub-wavelength accuracy. Among various enhancement schemes, millimeter-scale shift at near-infrared range has been realized by a simple symmetrical metal-cladding waveguide structure owing to its unique ultrahigh-order modes. However, the interpretation of the shift depends crucially on its definition. This paper shows that the shift of a Gaussian beam is discrete if we follow the light peak based on the stationary phase approach, where the M-lines are fixed to specific directions and the beam profile is separated near resonance. On the contrary, continuous shift can be obtained if the waveguide is illuminated by a vortex beam, and the physical cause can be attributed to the position-dependent phase-match condition of the ultrahigh-order modes due to the spatial phase distribution.

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Section: Introductionmentioning

confidence: 99%

Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide

Kan

Zhi²,

Yin

et al. 2022

Materials

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“…Zhao et al reported that graphene nanoribbon systems comprise a graphene strip loaded with a complex structure of graphene stub and ring cavity, thereby obtaining a considerably sharp PIT window. However, only a single-band PIT effect is acquired in the system [32]. Therefore, a dynamic tunable multiband PIT effect realized by graphene nanoribbon waveguide structure in the THz band remains relatively challenging.…”

Section: Introductionmentioning

confidence: 99%

“…However, only a single-band PIT effect is acquired in the system. [33] Therefore, a dynamic tunable multiband PIT effect realized by graphene nanoribbon waveguide structure in the THz band remains relatively challenging.…”

Section: Introductionmentioning

confidence: 99%

Dynamically tunable multiband plasmon-induced transparency effect based on graphene nanoribbon waveguide coupled with rectangle cavities system

Zhu¹,

Wang²,

Xiang³

et al. 2022

Chinese Phys. B

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A dynamically tunable multiband plasmon-induced transparency (PIT) effect in a series of rectangle cavities coupled with a graphene nanoribbon waveguide system is investigated theoretically and numerically by tuning the Fermi level of the graphene rectangle cavity. A single-PIT effect is realized using two different methods: one is the direct destructive interference between bright and dark modes, and the other is the indirect coupling through a graphene nanoribbon waveguide. Moreover, dual-PIT effect is obtained by three rectangle cavities side-coupled with a graphene nanoribbon waveguide. Results show that the magnitude of the dual-PIT window can be controlled between 0.21 and 0.74, and the corresponding group index is controlled between 143.2 and 108.6. Furthermore, the triple-PIT effect is achieved by the combination of bright–dark mode coupling and the cavities side-coupled with waveguide mechanism. Thus, sharp PIT windows can be formed, a high transmission is maintained between 0.51 and 0.74, and the corresponding group index is controlled between 161.4 and 115.8. Compared with previously proposed graphene-based PIT effects, the size of the introduced structure is less than 0.5 μm2. Particularly, the slow light effect is crucial in the current research. Therefore, a novel approach is introduced toward the realization of optical sensors, optical filters, and slow light and light storage devices with ultra-compact, multiband, and dynamic tunable.

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“…35 Zhao et al proposed a design of graphene waveguide structure to provide a sharper transparency window. 36 Even if the plasmon metamaterials have such achievements, one of the biggest challenges is the considerable energy loss due to radiation and ohmic loss. 37 The introduction of gain medium into plasmonic metamaterials is one of the effective channels to compensate the intrinsic loss of the system.…”

Section: Introductionmentioning

confidence: 99%

“…Our group has designed a graphene structure comprising two strips and a split ring resonator to realize a tunable optical filter through different carrier mobility . Zhao et al proposed a design of graphene waveguide structure to provide a sharper transparency window …”

Section: Introductionmentioning

confidence: 99%

Investigation on Tunable and Enhanced Optical Properties with Graphene Metamaterials

2020

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In this work, actively tunable and enhanced optical properties are investigated elaborately with graphene metamaterials, which consists of a π-shaped resonator and a hollow rectangular resonator. The unit cell is periodically arranged on the dielectric substrate. An obvious plasmon-induced transparency (PIT) effect is achieved through destructive interference between these two resonators. The tunable transparency window can be well regulated with the Fermi energy and polarization angle. Specifically, padding a gain medium onto the graphene metamaterials, the intrinsic loss of the system can be greatly compensated, and the resonant intensity gets amplified to achieve a dramatic stimulated emission of radiation with a low gain threshold. Meanwhile, tunable radiation emission is also realized by adjusting the polarization angle. This gain-assisted double-resonant amplification is intensively investigated to compensate the system loss and demonstrate the brilliant performance of the lasing spaser. To the best of our knowledge, these bifunctional plasmonic metamaterial-enabled tunable and enhanced optical properties are rarely investigated. This work demonstrates a novel modulation strategy to get tunable PIT resonance and paves the way toward designing adjustable lasing spasers with metamaterials.

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Electromagnetic induced transparency in graphene waveguide structure for Terahertz application

Cited by 18 publications

References 30 publications

Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide

Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide

Dynamically tunable multiband plasmon-induced transparency effect based on graphene nanoribbon waveguide coupled with rectangle cavities system

Investigation on Tunable and Enhanced Optical Properties with Graphene Metamaterials

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