Optimization of metamaterial structures for terahertz and microwave sensor applications

Basiri, Raheleh; Abiri, Habibollah; Yahaghi, Alireza

doi:10.1002/mop.28162

Cited by 9 publications

(13 citation statements)

References 35 publications

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“…The conducting wire strips are spaced with 0.2 μm to each other and printed over a thin dielectric substrate with a gap at the base of outer and inner spiral end. Polyimide is utilized here as a substrate material in the resonator design [37]. The relative permittivity of polyimide substrate material is ε r = 3.5, relative permeability μ r = 1.…”

Section: Proposed Metamaterials Unit Cell Structuresmentioning

confidence: 99%

Subwavelength negative index planar terahertz metamaterial arrays using spiral split ring resonators for near field sensing

Naeem

Ismail

Alhawari

et al. 2015

JAE

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This study reports new shape of meta-material array structures having electric and magnetic resonances designed for terahertz (THz) frequency band. The proposed structures exhibit left handed meta-material propertiesin THz frequency band. The introduced meta-material split ring resonators in this paper are constructed using a single loop of conducting wire strip printed over a very thin low permittivity polyimide dielectric substrate. The effective parameters like permeability and negative index are extracted from the simulated complex scattering parameters using direct retrieval method. Unloaded Qfactor is calculated for proposed terahertz metamaterial resonators. The proposed arrays are tested by loading different dielectric samples in order to confirm the testing capability. Significant shift in the transmission is observed. The reported array structures are novel in terms of their left handed behavior in THz frequencies. High values of Q-factor reported here, are suitable for near field sensing applications.

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Section: Proposed Metamaterials Unit Cell Structuresmentioning

confidence: 99%

Subwavelength negative index planar terahertz metamaterial arrays using spiral split ring resonators for near field sensing

Naeem

Ismail

Alhawari

et al. 2015

JAE

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“…The potential of the THz band is great. The THz band is an excellent part of the spectrum for spectroscopy, as different materials show different absorption spectra at THz frequencies [5,6,7]. When it comes to organics, many macromolecules such as protein and DNA have vibrational modes in this part of the spectrum [8].…”

Section: Introductionmentioning

confidence: 99%

“…In the past two decades, a sharp rise in interest in technologies and applications operating in the low-THz and THz bands has been evident. Emerging spectroscopy and sensing THz applications include imaging, remote sensing, security and safety screening, process monitoring, non-contact/non-destructive materials testing, biological, medical and pharmaceutical analysis, label-free probing of genetic material, indoor mapping and navigation, target detection, as well as many others [1,4,5,10,11,12,13,14,15]. Various technologies and combinations thereof can be deployed in applications such as space exploration, weather studies, military and automotive applications, medical diagnosis research and security.…”

Section: Introductionmentioning

confidence: 99%

“…Thermal THz detectors have also been used for detecting THz radiation, and early thermal THz detectors were predominantly based on bolometers [22]. In recent years, metamaterials with strong radiation-absorbing characteristics have also been investigated [5]. All of the above approaches lack the ability to amplify the signals properly, which is where the contribution of electronics has long been expected [26].…”

Section: Introductionmentioning

confidence: 99%

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Emerging Transistor Technologies Capable of Terahertz Amplification: A Way to Re-Engineer Terahertz Radar Sensors

Božanić

Sinha

2019

Sensors

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This paper reviews the state of emerging transistor technologies capable of terahertz amplification, as well as the state of transistor modeling as required in terahertz electronic circuit research. Commercial terahertz radar sensors of today are being built using bulky and expensive technologies such as Schottky diode detectors and lasers, as well as using some emerging detection methods. Meanwhile, a considerable amount of research effort has recently been invested in process development and modeling of transistor technologies capable of amplifying in the terahertz band. Indium phosphide (InP) transistors have been able to reach maximum oscillation frequency (fmax) values of over 1 THz for around a decade already, while silicon-germanium bipolar complementary metal-oxide semiconductor (BiCMOS) compatible heterojunction bipolar transistors have only recently crossed the fmax = 0.7 THz mark. While it seems that the InP technology could be the ultimate terahertz technology, according to the fmax and related metrics, the BiCMOS technology has the added advantage of lower cost and supporting a wider set of integrated component types. BiCMOS can thus be seen as an enabling factor for re-engineering of complete terahertz radar systems, for the first time fabricated as miniaturized monolithic integrated circuits. Rapid commercial deployment of monolithic terahertz radar chips, furthermore, depends on the accuracy of transistor modeling at these frequencies. Considerations such as fabrication and modeling of passives and antennas, as well as packaging of complete systems, are closely related to the two main contributions of this paper and are also reviewed here. Finally, this paper probes active terahertz circuits that have already been reported and that have the potential to be deployed in a re-engineered terahertz radar sensor system and attempts to predict future directions in re-engineering of monolithic radar sensors.

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“…Terahertz (THz) technology has rapidly become attractive in recent years due to its potential for applications in communications, imaging, and especially in sensing [1][2][3][4][5][6][7]. THz sensors/ detectors are one of system in this band that has been identified for detecting hidden explosives, chemical and biological agents.…”

Section: Introductionmentioning

confidence: 99%

THz spatial filter employing bimaterial switching for temperature sensing

Sanphuang

Nahar

Volakis

2016

Micro & Optical Tech Letters

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We propose a THz spatial filter using frequency selective surfaces (FSS) integrated with bimaterial actuator for temperature sensing. The actuator consists of two materials that have different thermal expansion rates and controlled based on temperature tuning. In this paper, we develop reconfigurable filters operating in the THz band that subjected to the temperature gradient of the surrounding medium. The filter was fabricated using gold to create the filter pattern printed on silicon substrate. SiO2 and Al were used as bimaterial actuators. The equivalent circuit was extracted and demonstrated. Measurement and simulation results show good agreement with excellent transmittance (>80%). According to different gap of the actuator (up and down), the peak frequency is varied from 0.36 to 0.34 THz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:168–171, 2017

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Optimization of metamaterial structures for terahertz and microwave sensor applications

Cited by 9 publications

References 35 publications

Subwavelength negative index planar terahertz metamaterial arrays using spiral split ring resonators for near field sensing

Subwavelength negative index planar terahertz metamaterial arrays using spiral split ring resonators for near field sensing

Emerging Transistor Technologies Capable of Terahertz Amplification: A Way to Re-Engineer Terahertz Radar Sensors

THz spatial filter employing bimaterial switching for temperature sensing

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