Peak modulation in multicavity-coupled graphene-based waveguide system

Wang, Jicheng; Wang, Xiaosai; Shao, Hui; Hu, Zheng; Zheng, Gaige; Feng, Zhaochi

doi:10.1186/s11671-016-1791-0

Cited by 26 publications

(6 citation statements)

References 35 publications

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“…The real part of the effective mode index decreases as the voltage bias

increases, causing the reduction of SPs’ mode confinement. In addition, the imaginary part also decreases sharply as

increases, which indicates that the propagation loss of SPs decreases [ 30 , 31 , 32 , 33 , 34 ]. Hence, it is expected that the longer propagation distance of the SPs occurs at a larger bias voltage.…”

Section: Theory and Simulation Methodsmentioning

confidence: 99%

Actively Tunable Terahertz Switches Based on Subwavelength Graphene Waveguide

et al. 2018

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As a new field of optical communication technology, on-chip graphene devices are of great interest due to their active tunability and subwavelength scale. In this paper, we systematically investigate optical switches at frequency of 30 THz, including Y-branch (1 × 2), X-branch (2 × 2), single-input three-output (1 × 3), two-input three-output (2 × 3), and two-input four-output (2 × 4) switches. In these devices, a graphene monolayer is stacked on the top of a PMMA (poly methyl methacrylate methacrylic acid) dielectric layer. The optical response of graphene can be electrically manipulated; therefore, the state of each channel can be switched ON and OFF. Numerical simulations demonstrate that the transmission direction can be well manipulated in these devices. In addition, the proposed devices possess advantages of appropriate ON/OFF ratios, indicating the good performance of graphene in terahertz switching. These devices provide a new route toward terahertz optical switching.

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“…The real part of the effective mode index decreases as the voltage bias

increases, causing the reduction of SPs’ mode confinement. In addition, the imaginary part also decreases sharply as

Section: Theory and Simulation Methodsmentioning

confidence: 99%

Actively Tunable Terahertz Switches Based on Subwavelength Graphene Waveguide

et al. 2018

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“…[6] Graphene is a new type of two-dimensional material, which has been applied in many fields. [7][8][9] Compared to conventional metal materials (e.g., silver and gold), graphene has desirable properties, such as tunability, extreme confinement, crystallinity and low loss. Because of these unique properties, graphene has been recently proposed as a platform for plasmon waveguiding from THz to infrared frequencies.…”

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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“…Initially, silver nanoparticles were synthesized by various routes, including lithographic techniques, biological techniques, physical methods, and chemical methods [16–18]. Among those, wet chemical reduction method has been a distinguished one since it is simple to fabricate uniform particles and suitable to be applied in large-scale production.…”

Section: Introductionmentioning

confidence: 99%

The Influence of CTAB-Capped Seeds and Their Aging Time on the Morphologies of Silver Nanoparticles

et al. 2019

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Contrast to the polydisperse nanorods formed by common seed-mediated growth method without the presence of cetyltrimethylammonium bromide (CTAB) in seed solution, we successfully obtained silver nanoparticles with different morphologies in the same reaction system by addition of CTAB in the seed solution. In this work, an appropriate amount of CTAB was added into the solution to prepare silver seed crystals. The results show that the aging time of silver seeds have a great influence on the sizes and morphologies of silver nanoparticles and thus the shape-controllable silver nanoparticles can be easily achieved by simply changing the seed aging time. The results also support that the selective adsorption ability or adsorption behavior of TSC can be adjusted by adding CTAB in the preparation procedure of silver seeds. We suggest that different aging times generate different effects on the competitive adsorption between CTAB and citrate to induce the orientation growth of silver seeds. As a result, silver nanospheres, nanorods, and triangular nanoplates can be easily prepared in the same system. In addition, we overcome the time limitation about the use of the seeds by adding CTAB into seed solution and make the synthesis of silver or other metal nanoparticles with different morphologies more easily and more efficiently. Electronic supplementary material The online version of this article (10.1186/s11671-019-2898-x) contains supplementary material, which is available to authorized users.

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Peak modulation in multicavity-coupled graphene-based waveguide system

Cited by 26 publications

References 35 publications

Actively Tunable Terahertz Switches Based on Subwavelength Graphene Waveguide

Actively Tunable Terahertz Switches Based on Subwavelength Graphene Waveguide

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

The Influence of CTAB-Capped Seeds and Their Aging Time on the Morphologies of Silver Nanoparticles

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