Cross-slot nano-antenna with graphene coat for bio-sensing application

Zarrabi, Ferdows B.; Naser‐Moghadasi, Mohammad; Heydari, Samaneh; Maleki, Mahshid; Arezomand, Afsaneh Saee

doi:10.1016/j.optcom.2016.03.048

Cited by 42 publications

(13 citation statements)

References 32 publications

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“…By Finite-difference time-domain method analyzing, the field intensity for the antenna with the structure was enhanced by 28.2 times. After added graphene coat and a cross shape chain of silicon dioxide to the structure, the intensity was enhanced by 43.9 times [64]. Zangeneh-Nejad et al proposed a hybrid graphene molybdenum disulphide-based photoconductive antenna, which provides not only high input impedance and reconfigurability but also high values of matching efficiency and radiation efficiency.…”

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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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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“…Rectennas in the microwave domain with conversion efficiencies greater than 70% have been exhibited. In contrast, rectennas operating at long infrared wavelengths use nanoantennas integrated with planar MIM diodes [280,281]. However, the present MIM diode designs are constrained in working frequency because of high RC response time and poor impedance mismatch with the coupled antenna, thus limiting the utilization for power conversion in the optical range.…”

Section: Graphene-based Rectennas For Energy Harvesting Applicationsmentioning

confidence: 99%

“…The authors further extended their investigation to biosensing applications, where they proved that biosensing is highly dependent on the ultra-thin buffer layer between graphene and the substrate layer. Moreover, graphene-based nano-aperture antennas can provide enhanced bio sensitivity and accuracy with cross-shaped slots in the antenna sensor geometry [280]. The reconfigurability in subsequent work by the same authors is realized by employing fractal geometries [281] in the graphene-based nano-aperture antennas which have the advantage of confined electric fields, thus achieving greater sensitivity than the previous one.…”

Section: Graphene-based Antennas For Plasmonic and Biosensingmentioning

confidence: 99%

A Review on the Development of Tunable Graphene Nanoantennas for Terahertz Optoelectronic and Plasmonic Applications

Ullah

Witjaksono

Nawi

et al. 2020

Sensors

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Exceptional advancement has been made in the development of graphene optical nanoantennas. They are incorporated with optoelectronic devices for plasmonics application and have been an active research area across the globe. The interest in graphene plasmonic devices is driven by the different applications they have empowered, such as ultrafast nanodevices, photodetection, energy harvesting, biosensing, biomedical imaging and high-speed terahertz communications. In this article, the aim is to provide a detailed review of the essential explanation behind graphene nanoantennas experimental proofs for the developments of graphene-based plasmonics antennas, achieving enhanced light–matter interaction by exploiting graphene material conductivity and optical properties. First, the fundamental graphene nanoantennas and their tunable resonant behavior over THz frequencies are summarized. Furthermore, incorporating graphene–metal hybrid antennas with optoelectronic devices can prompt the acknowledgment of multi-platforms for photonics. More interestingly, various technical methods are critically studied for frequency tuning and active modulation of optical characteristics, through in situ modulations by applying an external electric field. Second, the various methods for radiation beam scanning and beam reconfigurability are discussed through reflectarray and leaky-wave graphene antennas. In particular, numerous graphene antenna photodetectors and graphene rectennas for energy harvesting are studied by giving a critical evaluation of antenna performances, enhanced photodetection, energy conversion efficiency and the significant problems that remain to be addressed. Finally, the potential developments in the synthesis of graphene material and technological methods involved in the fabrication of graphene–metal nanoantennas are discussed.

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“…Due to the advances achieved in the investigations of electromagnetic properties of nanostructure materials, the interest in the field of nanoplasmonics is rapidly increasing [1][2][3], which has opened up many opportunities toward practical applications. The extreme confinement and enhancement of light at the nanoscale are very interesting features of metallic nanostructures [4][5][6][7]. The understanding of this confinement has led to the development of a wide range of interesting materials for various fields.…”

Section: Introductionmentioning

confidence: 99%

Refractive Index Sensor Mim Based Waveguide Coupled With a Slotted Side Resonator

Achi¹,

Hocini²,

Salah³

et al. 2020

PIER M

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In this paper, a plasmonic sensor based on a metal-insulator-metal (MIM) waveguide with a slotted side-coupled racetrack cavity is proposed. The transmission characteristics of the cavity are analyzed theoretically, and the improvements of performance for the racetrack cavity structure compared to a single disk cavity are studied. The influence of structural parameters on the transmission spectra and sensing performances is investigated thoroughly. The achieved sensitivity for the first mode was S = 959 nm/RIU and S = 2380 nm/RIU for the second one. Its corresponding sensing resolution is 1.04 × 10 −5 RIU for mode 1 and 4.20 × 10 −6 RIU for mode 2, respectively, and high transmissions are achieved at the two resonant wavelengths of 898.8 nm and 1857.1 nm. The proposed plasmonic sensor is a good candidate for designing novel devices and applications, in the field of chemical and biological sensing, and also in the field of plasmonic filters, switches, etc.

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Cross-slot nano-antenna with graphene coat for bio-sensing application

Cited by 42 publications

References 32 publications

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

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

A Review on the Development of Tunable Graphene Nanoantennas for Terahertz Optoelectronic and Plasmonic Applications

Refractive Index Sensor Mim Based Waveguide Coupled With a Slotted Side Resonator

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