Graphene Based Monopole Terahertz Antennas on Polyimide Substrate
01 Feb 2018-
TL;DR: In this article, the authors presented the modelling and analysis of graphene-based monopole antennas for terahertz (THz) Band communications in micro-networks, where Graphene is used as a conductor for radiating patch and ground in monopole antenna structures.
Abstract: This paper presents the modelling and analysis of graphene based monopole antennas for Terahertz (THz) Band communications in micro-networks. Graphene is used as a conductor for radiating patch and ground in monopole antenna structures. Polyimide of thickness 143 µm is used as substrate with relative permittivity of 3.5. Two types of antennas were modelled; one is narrowband resonating at 0.1 THz and the other is wideband operating in 0.030-0.117 THz band. The second antenna has broader impedance bandwidth (>10%) in the band of operation.
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01 Nov 2019
TL;DR: In this paper, a unique model of a metasurface that works as a biosensor to distinguish carcinoma cells on Terahertz time domain spectroscopy has been designed exploiting metamaterials.
Abstract: A unique model of a Metasurface that works as a biosensor to distinguish carcinoma cells on Terahertz time domain spectroscopy has been designed exploiting metamaterials. Cancer cell apoptosis by the action of drug concentration is monitored using the resonating frequency shift of the double split ring resonator inculcating double asymmetry. The structure that controls the plasma response of the metamaterial is explicitly made to degrade after the completion of medication.
3 citations
Cites background from "Graphene Based Monopole Terahertz A..."
...But again, Copper is toxic for human health, hence nowadays biocompatible Graphene is used [4] since it has sufficient conductivity at THz range of frequencies, but yet again it has to be made to degrade after a period of time using body enzymes which is not effective....
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01 Jan 2021
TL;DR: In this article, a resonating plasmon-like behavior obtained in a metasurface composite to acquire the real-time teratocarcinoma biophysical information is proposed, miniaturization has been done with respect to frequency in order to combat the skin depth challenges of THz communication from C band data.
Abstract: A resonating plasmon like behavior obtained in a metasurface composite to acquire the real-time teratocarcinoma biophysical information is proposed, miniaturization has been done with respect to frequency in order to combat the skin depth challenges of THz communication in bio sensing from C band data. Metamaterial units are programmed to induce a non radiative energy loss resulting in an absorbance property utilized for raising the temperature of the cells that serves for targeted ablation therapy. While resonant frequency shifts illustrate the sensitivity, threshold level of power density for the minimal energy that the cells can receive without dielectric property changes is determined experimentally in the far field region. With label free detection from THz illumination, metamaterial trapped bound state continuum amplifies the malignant cell's thermal energy and this is further applied for explicitly dissipating enough heat to initiate a smart cell death. This gives a mechanism of proliferative apoptosis stimulated with near photonic manipulation via the spectroscopic response of cell dielectric on a metasurface based sensor to calibrate power density for identifying the cell signature at 4 GHz.
2 citations
01 Jul 2020
TL;DR: In this paper, a resonating plasmon-like behavior is obtained when a metasurface composite is employed to sense and acquire the real-time carcinoma biophysical information.
Abstract: A resonating plasmon like behavior is obtained when a metasurface composite is employed to sense and acquire the real-time carcinoma biophysical information. Miniaturization has been done with respect to frequency in order to combat the skin depth challenges of THz considering its non ionization capabilities. If cancerous cells are programmed to be ablated, absorbance property of metasurface is utilized for raising the temperature using thermal analysis. The threshold level of power density for the minimal energy that the cells can absorb without dielectric property changes is determined experimentally in the far field. Metamaterial trapped non radiative decay raises the temperature and the observed changes are applied for explicitly dissipating enough heat to initiate cell death. Thus apoptosis is analyzed with photonic manipulation of the spectroscopic response of cell complex permittivity on a metasurface design and related to the irradiated power density illuminating the sensor during measurement at 4GHz.
2 citations
Cites methods from "Graphene Based Monopole Terahertz A..."
...Although Graphene can be used [9] since it has sufficient conductivity at THz range of frequencies, but yet to utilize Copper FR4 composite, we have tested the initial version that is presented in the paper....
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01 Feb 2020
TL;DR: A compact system-on-chip based biosensor for detection and monitoring of breast cancer cells has been proposed to provide better spectral signature fetching and the concept is proved.
Abstract: A compact system-on-chip based biosensor for detection and monitoring of breast cancer cells has been proposed to provide better spectral signature fetching and the concept is proved Human body cells are seeded on the meta surface that is excited to study the sensor response in Time domain spectroscopy environment It replaces conventional techniques to diagnose malignancy, and can measure the efficiency of drug composition with the action duration for complete apoptosis Resonance is observed at 086THz where the sensor controls the Surface Plasmon fields due to the Terahertz incident waves impinging on the meta surface The implantable system consists of a substrate that degrades along with the meta surface that has been characterized to be showing simultaneously dual negative material nature (DNG)
2 citations
Cites background from "Graphene Based Monopole Terahertz A..."
...Materials like graphene shows electron gating and hence a good tuning capacity for being used as a radiating surface with a monopole antenna for a biosensor [4]....
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References
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Book•
01 Jan 1982
TL;DR: The most up-to-date resource available on antenna theory and design as mentioned in this paper provides an extended coverage of ABET design procedures and equations making meeting ABET requirements easy and preparing readers for authentic situations in industry.
Abstract: The most-up-to-date resource available on antenna theory and design Expanded coverage of design procedures and equations makes meeting ABET design requirements easy and prepares readers for authentic situations in industry New coverage of microstrip antennas exposes readers to information vital to a wide variety of practical applicationsComputer programs at end of each chapter and the accompanying disk assist in problem solving, design projects and data plotting-- Includes updated material on moment methods, radar cross section, mutual impedances, aperture and horn antennas, and antenna measurements-- Outstanding 3-dimensional illustrations help readers visualize the entire antenna radiation pattern
14,065 citations
"Graphene Based Monopole Terahertz A..." refers background in this paper
...The above condition should be satisfied in order to restrict the formation of surface waves in the traditional metallic patch antennas [10]....
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01 Jan 2005
TL;DR: The most up-to-date resource available on antenna theory and design is the IEEE 802.11 as mentioned in this paper, which provides detailed coverage of ABET design procedures and equations, making meeting ABET requirements easy and preparing readers for authentic situations in industry.
Abstract: The most-up-to-date resource available on antenna theory and design. Expanded coverage of design procedures and equations makes meeting ABET design requirements easy and prepares readers for authentic situations in industry. New coverage of microstrip antennas exposes readers to information vital to a wide variety of practical applications.Computer programs at end of each chapter and the accompanying disk assist in problem solving, design projects and data plotting.-- Includes updated material on moment methods, radar cross section, mutual impedances, aperture and horn antennas, and antenna measurements.-- Outstanding 3-dimensional illustrations help readers visualize the entire antenna radiation pattern.
2,907 citations
TL;DR: It is demonstrated that graphene plasmon resonances can be tuned over a broad terahertz frequency range by changing micro-ribbon width and in situ electrostatic doping and the results represent a first look at light-plasmon coupling in graphene and point to potential graphene-based terAhertz metamaterials.
Abstract: Plasmons describe collective oscillations of electrons. They have a fundamental role in the dynamic responses of electron systems and form the basis of research into optical metamaterials 1–3 . Plasmons of two-dimensional massless electrons, as present in graphene, show unusual behaviour 4–7 that enables new tunable plasmonic metamaterials 8–10 and, potentially, optoelectronic applications in the terahertz frequency range 8,9,11,12 .H ere we explore plasmon excitations in engineered graphene microribbon arrays. We demonstrate that graphene plasmon resonances can be tuned over a broad terahertz frequency range by changing micro-ribbon width and in situ electrostatic doping. The ribbon width and carrier doping dependences of graphene plasmon frequency demonstrate power-law behaviour characteristic of two-dimensional massless Dirac electrons 4–6 . The plasmon resonances have remarkably large oscillator strengths, resulting
2,701 citations
"Graphene Based Monopole Terahertz A..." refers background in this paper
...Graphene can therefore be applied to devices operating in THz domain[6]....
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TL;DR: In this paper, the features of the graphene mono-and multilayer reflectance in the far-infrared region were analyzed as a function of frequency, temperature, and carrier density taking the intraband conductance and the interband electron absorption into account.
Abstract: We analyze the features of the graphene mono- and multilayer reflectance in the far-infrared region as a function of frequency, temperature, and carrier density taking the intraband conductance and the interband electron absorption into account. The dispersion of plasmon mode of the multilayers is calculated using Maxwell's equations with the influence of retardation included. At low temperatures and high electron densities, the reflectance of multilayers as a function of frequency has the sharp downfall and the subsequent deep well due to the threshold of electron interband absorption and plasmon excitations.
842 citations
"Graphene Based Monopole Terahertz A..." refers background in this paper
...Calculation of surface conductivity of an infinite graphene sheet can be displayed through Kubo equation [14, 18]....
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TL;DR: It is shown that an atomically thin graphene monolayer may drastically suppress the scattering of planar and cylindrical objects and, at the same time, preserve moderately broad bandwidth of operation.
Abstract: We discuss here the use of a graphene monolayer to realize the concept of “cloaking by a surface”, proposing the thinnest possible mantle cloak with operation in the far-infrared and terahertz (THz) regime. We show that an atomically thin graphene monolayer may drastically suppress the scattering of planar and cylindrical objects and, at the same time, preserve moderately broad bandwidth of operation. In addition, we exploit the large tunability of the graphene conductivity to provide active, dynamically tunable invisibility cloaks and versatile THz switching devices.
621 citations
"Graphene Based Monopole Terahertz A..." refers methods in this paper
...1 (b), where σ is the frequency dependent conductivity computed using the above equations [15, 16]....
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