Characterization of cylindrical terahertz metallic hollow waveguide with multiple dielectric layers

Sun, Bangshan; Tang, Xiaoli; Zeng, Xuan; Shi, Yi-Wei

doi:10.1364/ao.51.007276

Cited by 9 publications

(5 citation statements)

References 65 publications

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“…While AFM was used in that study to show that exposed interfaces were smooth, no NR or analogous data were presented to characterize internal interfaces. Other polymer dielectric multilayer examples included much more polar or polarizable layers appropriate for their intended applications, such as poly(vinylidene fluoride–trifluoroethylene), poly(vinylphenol), and elemental tellurium. − …”

Section: Discussionmentioning

confidence: 99%

Synthesis, Fabrication, and Heterostructure of Charged, Substituted Polystyrene Multilayer Dielectrics and Their Effects in Pentacene Transistors

Alley¹,

Plunkett²,

Kale³

et al. 2016

Macromolecules

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Charge trapping and storage in polymer dielectrics can be harnessed to control semiconductor devices. Organic transistor (OFET) gate insulators affect bias stress and threshold voltage (V th), and charging them can preset the operating voltages and control bias stress. We describe a chemical design and film fabrication procedure for construction of stacks of polystyrene (PS) layers, each with arbitrary concentrations of potentially chargeable functional groups. Thermal cross-linking of benzocyclobutene subunits ensures layer integrity while keeping the layers free of polar functionality and small molecule byproducts. Neutron reflectivity (NR), scanning electron microscopy, and atomic force microscopy (AFM) showed that individual layer thicknesses varied systematically with polymer concentration in deposition solutions, and interfacial thicknesses ranged from 1.5 to 4 nm, independent of layer thickness, demonstrating formation of distinct layers with minimal roughness or intermixing. The PS-based materials were used as the sole gate dielectrics for pentacene OFETs. We compared V th before and after charging. Increased bias stress stability as evidenced by reduced V th shift was seen in devices with trilayer dielectrics with substituted PS as the middle layer compared to a dielectric made from unsubstituted PS. On the other hand, increased V th shift was seen in many devices with bilayer dielectrics made with substituted PS as the top layer. We attribute the decreased V th shift seen in trilayer devices to an increased dielectric polarization of the substituted PS in the middle layer that countered the charge trapping effect in the top layer. This demonstration establishes a method for utilizing vertical charge patterns for various electronics applications.

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Section: Discussionmentioning

confidence: 99%

Synthesis, Fabrication, and Heterostructure of Charged, Substituted Polystyrene Multilayer Dielectrics and Their Effects in Pentacene Transistors

Alley¹,

Plunkett²,

Kale³

et al. 2016

Macromolecules

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“…Another dielectric-lined metallic hollow waveguide (DMHW) design was theoretically proposed by Sun et al [76] to reduce the losses in the THz waveguide. They analyzed the multilayer structure to reduce the bend and transmission losses in the DMHW.…”

Section: Loss Reduction In Hybrid-clad Waveguidesmentioning

confidence: 99%

Low Loss THz Waveguides and Its Potentials towards 6G Communication: A Brief Chronicle Review

Sohoo

2024

IJEETC

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Advancement in technology has opened the doors for the terahertz (THz) frequency range to be applied in different fields for various applications. The future communication technology, especially 6G, will also intend to utilize the THz frequency band due to its large bandwidth that has the capabilities to achieve a high data rate. Great losses are presented in the early research into terahertz transmission medium. It is critical to design an appropriate waveguide that can integrate the THz waves into the system efficiently with minimum loss and provides the ease of transmission of data and overcomes the free space loss issues. Communication, sensing, and other application parameters are highly affected by transmission losses; therefore, low transmission loss and dispersion loss waveguide designs are required for proper utilization. In this paper, the review on reduction in the transmission loss in different types of waveguides operating at the Terahertz frequency range is studied. The design and the experimental setup for several classes of THz waveguides for minimizing transmission loss are also discussed. The review study shows that these waveguides can be a promising transmission medium for future 6G communication.

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“…Significant initiatives have been made to promote the development of efficient terahertz waveguides by using electronic and photonic methods [5][6][7][8]. When the signal frequency transfers into the terahertz region, the high Ohmic loss of metals and dielectric material absorption make many traditional waveguides can not be used to efficiently guide terahertz wave, including hollow metallic waveguide [9], microstrip [10], coplanar waveguide [11] and optical fiber [12]. Photonic band gap fibers generally contain the air hole array in the cladding region and a central air hole to transmit waves in the core region.…”

Section: Introductionmentioning

confidence: 99%

Proposal for a symmetrical petal core terahertz waveguide for terahertz wave guidance

Yan

Miao

et al. 2020

J. Phys. D: Appl. Phys.

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Countering the terahertz wave applications ‘inefficient transmission’ calls for rapid development in terahertz waveguides that could simultaneously minimize confinement loss, chromatic dispersion and maximize the fraction of power. Here, a new kind of symmetrical petal hollow core terahertz waveguide based on cyclic olefin homopolymer is proposed to achieve low confinement loss, low chromatic dispersion and a high fraction of power. In this designed waveguide, a symmetrical petal-shaped air hole is treated as the core and circular air holes arranged as sunflower-type are inserted in the cladding. The guiding characteristics of the designed waveguide are simulated and analyzed based on the finite element method with perfectly matched layer boundary condition. Based on the optimum structure parameters, it exhibits a minimum confinement loss of 0.0089 dB cm−1 at 2.58 THz and a < 0.07 dB cm−1 bandwidth spanning across 2.51–2.71 THz. Furthermore, in the same frequency region, the high core power fraction is above 93%, and the group velocity dispersion values are lower than 0.6 ps/THz/cm.

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Characterization of cylindrical terahertz metallic hollow waveguide with multiple dielectric layers

Cited by 9 publications

References 65 publications

Synthesis, Fabrication, and Heterostructure of Charged, Substituted Polystyrene Multilayer Dielectrics and Their Effects in Pentacene Transistors

Synthesis, Fabrication, and Heterostructure of Charged, Substituted Polystyrene Multilayer Dielectrics and Their Effects in Pentacene Transistors

Low Loss THz Waveguides and Its Potentials towards 6G Communication: A Brief Chronicle Review

Proposal for a symmetrical petal core terahertz waveguide for terahertz wave guidance

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