Peak amplitude enhancement of photoconductive antenna using periodic nanoslit and graphene in the THz band

Kazemi, Amir Hossein; Mahani, Fatemeh Fouladi; Mokhtari, Arash

doi:10.1016/j.ijleo.2019.03.033

Cited by 15 publications

(7 citation statements)

References 15 publications

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“…113,114 In a continuation of Ref. 110, Kazemi et al 115 numerically demonstrated the improvement of the transmission for both TE-and TM-polarized waves by the additional incorporation of mixed graphene electrodes, which resulted in the increase of the detected THz signal. With the proposed design, the transmission through periodic dielectric slits became more than 96% and 98.65% for TE and TM polarizations, respectively.…”

Section: Dielectric Metasurfacesmentioning

confidence: 94%

Metallic and dielectric metasurfaces in photoconductive terahertz devices: a review

et al. 2019

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This review highlights recent and novel trends focused on metallic (plasmonic) and dielectric metasurfaces in photoconductive terahertz (THz) devices. We demonstrate the great potential of its applications in the field of THz science and technology, nevertheless indicating some limitations and technological issues. From the state-of-the-art, the metasurfaces are, by far, able to force out previous approaches like photonic crystals and are capable of significantly increasing the performance of contemporary photoconductive devices operating at THz frequencies.

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Section: Dielectric Metasurfacesmentioning

confidence: 94%

Metallic and dielectric metasurfaces in photoconductive terahertz devices: a review

et al. 2019

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“…For homogenous dielectric material, the displacement vector of the graphene patch is D n = en s /2 = ε s E 0 . Where ε s is the permittivity of the homogenous dielectric, n s is the two-sided graphene surface charge density [39]. The surface charge density can be evaluated by using equation (3).…”

Section: Characteristic Analysis Of Graphenementioning

confidence: 99%

A micro-scaled graphene-based tree-shaped wideband printed MIMO antenna for terahertz applications

Babu¹,

Das

Varshney³

et al. 2022

J Comput Electron

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A tree-shaped graphene based microstrip MIMO antenna for terahertz applications is proposed.The proposed MIMO antenna is designed on a 600×300 μm 2 polyimide substrate. The designed MIMO antenna exhibits a wide impedance bandwidth of 88.14% (0.276 -0.711 THz) due to the suggested modifications in the antenna configuration. The MIMO design parameters like total active reflection coefficient (TARC), mean effective gain (MEG), envelope correlation coefficient (ECC) and diversity gain (DG), Channel capacity loss (CCL) are evaluated and their values are found within acceptable limits. The proposed MIMO structure offers MEG ≤ −3.0 dB, TARC≤ -10.0 dB, DG≈ 10 dB, CCL < 0.5 bps/Hz/sec and ECC < 0.01 at the resonant frequency. At the resonant frequency, the isolation between the radiating elements of the proposed MIMO is recorded as −52 dB. The variations in operating frequency and S-parameters are also analyzed as a function of the chemical potential (μc) of the graphene material.The parametric analysis, structural design evolution steps, surface current distribution, antenna characteristics parameters and diversity parameters are discussed in detail in this paper. The designed MIMO antenna is suitable for high speed short distance communication, video rate imaging, biomedical imaging, sensing, and security scanning in the THz frequency band.

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“…11, the reflection from the Si-GaAs interface was suppressed by~6.9% [68]. In 2019, Kazemi et al used mixed graphene-gold electrodes as electrode material of the antenna, which enhanced the detected THz signal peak amplitude up to 14.31% [69]. Korolev et al reported using nanoimprint lithography to enhance THz emission from MAPbI 3 perovskite upon femtosecond laser irradiation.…”

Section: Optimization Of Thz Systemmentioning

confidence: 99%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

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Peak amplitude enhancement of photoconductive antenna using periodic nanoslit and graphene in the THz band

Cited by 15 publications

References 15 publications

Metallic and dielectric metasurfaces in photoconductive terahertz devices: a review

Metallic and dielectric metasurfaces in photoconductive terahertz devices: a review

A micro-scaled graphene-based tree-shaped wideband printed MIMO antenna for terahertz applications

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

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