Bistable scattering in graphene-coated dielectric nanowires

Li, Rujiang; Wang, Huaping; Zheng, Bin; Dehdashti, Shahram; Li, Er‐Ping; Chen, Hongsheng

doi:10.1039/c7nr03056h

Cited by 17 publications

(9 citation statements)

References 56 publications

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“…To enhance the nonlinear responses, GCNWs were employed to beat this limitation. Based on GCNWs, Li et al [117] developed a nonlinear scattering model under the mean field approximation and studied the bistable scattering in a GCNW based on the semi-analytical solutions. It was found that the switching intensities of bistable scattering can be smaller than 1 MW/cm 2 at the working frequency.…”

Section: Optical Bistabilitymentioning

confidence: 99%

Graphene-Coated Nanowire Waveguides and Their Applications

Teng

Wang

2020

Nanomaterials

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In recent years, graphene-coated nanowires (GCNWs) have attracted considerable research interest due to the unprecedented optical properties of graphene in terahertz (THz) and mid-infrared bands. Graphene plasmons in GCNWs have become an attractive platform for nanoscale applications in subwavelength waveguides, polarizers, modulators, nonlinear devices, etc. Here, we provide a comprehensive overview of the surface conductivity of graphene, GCNW-based plasmon waveguides, and applications of GCNWs in optical devices, nonlinear optics, and other intriguing fields. In terms of nonlinear optical properties, the focus is on saturable absorption. We also discuss some limitations of the GCNWs. It is believed that the research of GCNWs in the field of nanophotonics will continue to deepen, thus laying a solid foundation for its practical application.

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Section: Optical Bistabilitymentioning

confidence: 99%

Graphene-Coated Nanowire Waveguides and Their Applications

Teng

Wang

2020

Nanomaterials

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“…In this kind of device, long propagation length and ultra-small mode size are desired. Particularly, the graphene-covered nanowires (GCNWs) [43,44,45,46,47,48,49,50,51,52,53] have attracted a lot of interest for their simple structure. Experiments [43,44] have shown that the dielectric nanowire can be easily coated by a graphene layer due to van der Waals force.…”

Section: Introductionmentioning

confidence: 99%

“…Huang et al [49] proposed a drop-shaped GCNW for terahertz waveguiding. Li et al [51] studied the bi-stable scattering in GCNWs. Nevertheless, the plasmon modes in GCNWs are relatively weak confined with normalized mode size about ~10 −3 .…”

Section: Introductionmentioning

confidence: 99%

High-Performance Transmission of Surface Plasmons in Graphene-Covered Nanowire Pairs with Substrate

et al. 2019

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Graphene was recently proposed as a promising alternative to support surface plasmons with superior performances in the mid-infrared range. Here, we theoretically show that high-performance and low-loss transmission of graphene plasmons can be achieved by adding a silica substrate to the graphene-covered nanowire pairs. The effect of the substrate layer on mode properties has been intensively investigated by using the finite element method. Furthermore, the results show that inserting a low index material layer between the nanowire and substrate could compensate for the loss accompanied by the substrate, thus the mode properties could be adjusted to fulfill better performance. A reasonable propagation length of 15 μm and an ultra-small normalized mode area about ~10−4 could be obtained at 30 THz. The introduction of the substrate layer is crucial for practical fabrication, which provides additional freedom to tune the mode properties. The graphene-covered nanowire pairs with an extra substrate may inspire potential applications in tunable integrated nanophotonic devices.

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“…Nowadays, the terahertz to mid-infrared spectrum, which typically ranges from 10 to 4000 cm À1 , is finding a wide variety of applications in information and communication, medical sciences, chemical and biological sensing, spectroscopy, among many others [18][19][20]. The great potential of graphene is in photonics, optoelectronics and plasmonics [21][22][23][24][25][26]. Other exhibited optoelectronic graphene devices include ultrafast lasers and broadband polarizers [27].…”

Section: Introductionmentioning

confidence: 99%

Terahertz optical bistability of graphene-coated cylindrical core–shell nanoparticles

et al. 2018

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In this study, we investigate the optical bistability of graphene-coated nanoparticles with cylindrical core-shell structure at terahertz frequency, because graphene displays optical bistability and multistability in a broad range of incident optical intensity. The choice of core-shell system is due to its larger local electric field enhancement, where this characteristic is important for the optical bistable systems. This optical bistability strongly depends on the geometry of the nanoparticle, the fractional volume of the metallic core as well as Fermi energy of graphene. The surrounding medium could also finely affect the optical bistability and induce switching from optical bistability to optical tristability. Since the prosperity of optoelectronics properties of graphene and the importance of core-shell nanoparticles have attracted enormous interest, this model may find potential applications in optical bistable devices such as all-optical switches and biosensors at terahertz communication in near future.

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Bistable scattering in graphene-coated dielectric nanowires

Cited by 17 publications

References 56 publications

Graphene-Coated Nanowire Waveguides and Their Applications

Graphene-Coated Nanowire Waveguides and Their Applications

High-Performance Transmission of Surface Plasmons in Graphene-Covered Nanowire Pairs with Substrate

Terahertz optical bistability of graphene-coated cylindrical core–shell nanoparticles

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