scholarly journals Coupling of waveguide mode and graphene plasmons

2021 ◽  
Vol 255 ◽  
pp. 07002
Author(s):  
Jiří Petráček ◽  
Jiří Čtyroký ◽  
Vladimír Kuzmiak ◽  
Pavel Kwiecien ◽  
Ivan Richter
Keyword(s):  
Low Power ◽  
Graphene Layer ◽  
Waveguide Mode ◽  
Chemical Potential ◽  
Temperature Sensing ◽  
Graphene Layers ◽  
Optical Wavelength ◽  
Electro Optic ◽  
Photonic Waveguides ◽  
Graphene Plasmons

Photonic waveguides with graphene layers have been recently studied for their potential as fast and low-power electro-optic modulators with small footprints. We show that in the optical wavelength range of 1.55 μm, surface plasmons supported by the graphene layer with the chemical potential exceeding ~0.5 eV can couple with the waveguide mode and affect its propagation. This effect might be possibly utilized in technical applications as a very low-power amplitude modulation, temperature sensing, etc.

scholarly journals Дисперсия объемных волн в структуре "графен--диэлектрик--графен"

2019 ◽  
Vol 126 (2) ◽  
pp. 224
Author(s):  
А.С. Абрамов ◽  
Д.А. Евсеев ◽  
И.О. Золотовский ◽  
Д.И. Семенцов
Keyword(s):  
Electric Field ◽  
Phase Velocity ◽  
Waveguide Mode ◽  
Chemical Potential ◽  
Dielectric Film ◽  
Dispersion Characteristics ◽  
Graphene Layers ◽  
Waveguide Modes ◽  
Phase And Group Velocities ◽  
Group Velocities

AbstractWe investigate the dispersion properties of the first waveguide modes in a dielectric film that is coated with graphene layers having different chemical potential values. The control over the phase and group velocities of the first waveguide mode is considered. Spectral intervals in which the phase velocity of the waveguide modes is small, while their group velocity is negative, are revealed. We show that the dispersion characteristics of the waveguide modes can be rearranged using an external electric field.

scholarly journals Low-Power Electro-Optic Actuators for Large-Scale Programmable Photonic Circuits

2021 ◽  
Author(s):  
Wim Bogaerts ◽  
Lukas Van Iseghem ◽  
Pierre Edinger ◽  
Hamed Sattari ◽  
Alain Yuji Takabayashi ◽  
...  
Keyword(s):  
Low Power ◽  
Large Scale ◽  
Photonic Circuits ◽  
Electro Optic

scholarly journals Quasicrystalline 30° twisted bilayer graphene as an incommensurate superlattice with strong interlayer coupling

2018 ◽  
Vol 115 (27) ◽  
pp. 6928-6933 ◽  
Author(s):  
Wei Yao ◽  
Eryin Wang ◽  
Changhua Bao ◽  
Yiou Zhang ◽  
Kenan Zhang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Graphene Layer ◽  
Rotational Symmetry ◽  
Reciprocal Lattice ◽  
Double Resonance ◽  
Interlayer Coupling ◽  
Bilayer Graphene ◽  
Lattice Vector ◽  
Graphene Layers ◽  
Twisted Bilayer Graphene

The interlayer coupling can be used to engineer the electronic structure of van der Waals heterostructures (superlattices) to obtain properties that are not possible in a single material. So far research in heterostructures has been focused on commensurate superlattices with a long-ranged Moiré period. Incommensurate heterostructures with rotational symmetry but not translational symmetry (in analogy to quasicrystals) are not only rare in nature, but also the interlayer interaction has often been assumed to be negligible due to the lack of phase coherence. Here we report the successful growth of quasicrystalline 30° twisted bilayer graphene (30°-tBLG), which is stabilized by the Pt(111) substrate, and reveal its electronic structure. The 30°-tBLG is confirmed by low energy electron diffraction and the intervalley double-resonance Raman mode at 1383 cm−1. Moreover, the emergence of mirrored Dirac cones inside the Brillouin zone of each graphene layer and a gap opening at the zone boundary suggest that these two graphene layers are coupled via a generalized Umklapp scattering mechanism—that is, scattering of a Dirac cone in one graphene layer by the reciprocal lattice vector of the other graphene layer. Our work highlights the important role of interlayer coupling in incommensurate quasicrystalline superlattices, thereby extending band structure engineering to incommensurate superstructures.

Low-power electro–optic phase modulator based on multilayer cgraphene/silicon nitride waveguide

2020 ◽  
Vol 29 (8) ◽  
pp. 084207
Author(s):  
Lanting Ji ◽  
Wei Chen ◽  
Yang Gao ◽  
Yan Xu ◽  
Chi Wu ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Low Power ◽  
Phase Modulator ◽  
Electro Optic

Ultra-Broadband, Low-Power, 2×2 Electro-Optic Switch using Sub-Micron Silicon Waveguides

2010 ◽  
Author(s):  
Joris Van Campenhout ◽  
William M. J. Green ◽  
Solomon Assefa ◽  
Yurii A. Vlasov
Keyword(s):  
Low Power ◽  
Silicon Waveguides ◽  
Electro Optic

scholarly journals Low-power, 2×2 silicon electro-optic switch with 110-nm bandwidth for broadband reconfigurable optical networks

2009 ◽  
Vol 17 (26) ◽  
pp. 24020 ◽  
Author(s):  
Joris Van Campenhout ◽  
William M. Green ◽  
Solomon Assefa ◽  
Yurii A. Vlasov
Keyword(s):  
Low Power ◽  
Optical Networks ◽  
Electro Optic

Graphene-based microwave coaxial antenna for microwave ablation: thermal analysis

2020 ◽  
pp. 1-9
Author(s):  
Burak Uzman ◽  
Adem Yilmaz ◽  
Hulusi Acikgoz ◽  
Raj Mittra
Keyword(s):  
Relaxation Time ◽  
Microwave Ablation ◽  
Graphene Layer ◽  
Heat Dissipation ◽  
Chemical Potential ◽  
Treatment Time ◽  
Slot Antenna ◽  
Necrotic Tissue ◽  
Cancerous Tissue ◽  
High Impedance

Abstract In this study, the problem of backward heating in microwave ablation technique is examined and an electromagnetic solution based on the use of high impedance graphene material is presented for its mitigation. In this context, a one-atom-thick graphene layer is added on the coaxial double slot antenna. In addition to the electromagnetic behavior, thermal effects caused by the graphene-covered antenna are emphasized. The graphene's conductivity being highly dependent on its chemical potential and the relaxation time, a parametric study is performed to determine a range of tolerances within which the graphene-coated antenna outperform a typical graphene-free antenna. The range of values is found to be 0 < μ c < 0.5 eV and τ < 0.4 ps, for the chemical potential and the relaxation time, respectively. The backward heating problem being prevented, the ablation region is ensured to be spherical around the tip of the antenna. Effects of the graphene layer to the heat dissipation in the tissue, the necrotic tissue ratio (damage to the cancerous tissue of the caused by electromagnetic energy), and the treatment time using the coaxial double slot antenna were examined. The results show that the heat dissipation is concentrated around the slots (region of cancerous tissue) and a higher necrotic tissue ratio can be achieved with a graphene-covered double slot antenna in a shorter time.

scholarly journals Low Power Consumption 3D-Inverted Ridge Thermal Optical Switch of Graphene-Coated Polymer/Silica Hybrid Waveguide

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 783
Author(s):  
Yue Cao ◽  
Yunji Yi ◽  
Yue Yang ◽  
Baizhu Lin ◽  
Jiawen Lv ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Graphene Layer ◽  
Optical Switch ◽  
Graphene Film ◽  
Core Layer ◽  
Low Power Consumption ◽  
Electrode Structure ◽  
Hybrid Waveguide ◽  
Silica Hybrid

An inverted ridge 3D thermal optical (TO) switch of a graphene-coated polymer/silica hybrid waveguide is proposed. The side electrode structure is designed to reduce the mode loss induced by the graphene film and by heating the electrode. The graphene layer is designed to be located on the waveguide to assist in the conduction of heat produced by the electrode. The inverted ridge core is fabricated by etching and spin-coating processes, which can realize the flat surface waveguide. This core improves the transfer of the graphene layer and the compatibility of the fabrication processes. Because of the opposite thermal optical coefficient of polymer and silica and the high thermal conductivity of the graphene layer, the 3D hybrid TO switch with low power consumption and fast response time is obtained. Compared with the traditional TO switch without graphene film, the power consumption of the proposed TO switch is reduced by 41.43% at the wavelength of 1550 nm, width of the core layer (a) of 3 μm, and electrode distance (d) of 4 μm. The rise and fall times of the proposed TO switch are simulated to be 64.5 μs and 175 μs with a d of 4 μm, and a of 2 μm, respectively.

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