Tunable ultrasensitive terahertz sensor based on complementary graphene metamaterials

He, Xiaodong; Zhang, Qinfei; Lu, Guangjun; Ying, Guobing; Wu, Fengmin; Jiang, Jiuxing

doi:10.1039/c5ra21974d

Cited by 65 publications

(26 citation statements)

References 32 publications

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“…Tao et al [87] proposed a THz paper-based metamaterial sensor that offers distinctive resonance shifts due to the electromagnetic resonant responses at predefined frequencies for increased sensitivity and quantitative analysis of biochemical compounds. Another approach for ultrasensitive sensing of biomolecules proposes a THz sensor based on a graphene metamaterial layer that boosts the absorption of samples and tunes the sensing domain by changing the Fermi energy [88].…”

Section: Integrating Thz-based Technologies With Current Diagnosismentioning

confidence: 99%

Terahertz Spectroscopy and Imaging: A Cutting-Edge Method for Diagnosing Digestive Cancers

et al. 2019

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The Terahertz’s wavelength is located between the microwave and the infrared region of the electromagnetic spectrum. Because it is non-ionizing and non-invasive, Terahertz (THz)-based detection represents a very attractive tool for repeated assessments, patient monitoring, and follow-up. Cancer acts as the second leading cause of death in many regions, and current predictions estimate a continuous increasing trend. Of all types of tumors, digestive cancers represent an important percentage and their incidence is expected to increase more rapidly than other tumor types due to unhealthy lifestyle habits. Because it can precisely differentiate between different types of molecules, depending on water content, the information obtained through THz-based scanning could have several uses in the management of cancer patients and, more importantly, in the early detection of different solid tumors. The purpose of this manuscript is to offer a comprehensive overview of current data available on THz-based detection for digestive cancers. It summarizes the characteristics of THz waves and their interaction with tissues and subsequently presents available THz-based technologies (THz spectroscopy, THz-tomography, and THZ-endoscope) and their potential for future clinical use. The third part of the review is focused on highlighting current in vitro and in vivo research progress in the field, for identifying specific digestive cancers known as oral, esophageal, gastric, colonic, hepatic, and pancreatic tumors.

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Section: Integrating Thz-based Technologies With Current Diagnosismentioning

confidence: 99%

Terahertz Spectroscopy and Imaging: A Cutting-Edge Method for Diagnosing Digestive Cancers

et al. 2019

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“…Based on this, several notable works utilizing near-field enhancement in metallic nanostructures have been demonstrated in the mid-IR region. [157][158][159][160] Interestingly, Fano modes could www.advopticalmat.de [150][151][152] Interestingly, graphene provides an excellent 2D platform for a stable adsorption of molecules.…”

Section: Sensing and Spectroscopy Of Moleculesmentioning

confidence: 99%

“…Consequently, several metamaterial-graphene hybrid device concepts have been proposed. [157][158][159][160] Interestingly, Fano modes could www.advopticalmat.de Adv. Optical Mater.…”

Section: Sensing and Spectroscopy Of Moleculesmentioning

confidence: 99%

2D Materials for Terahertz Modulation

Gopalan

Sensale‐Rodriguez

2019

Advanced Optical Materials

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power consumption and minimizing cross-talk (maintain signal fidelity). As a result, terabit data communication can be made feasible with the help of broadband all-optical devices and circuits. [4] The technology for designing optical components and circuits operating at visible and NIR wavelengths has matured significantly over the last several decades, ensuring their widespread integration. While we can work toward improving data transmission rates of existing communication technology, shortage of spectral bandwidth for data transmission has become a looming problem over time. This has motivated researchers to seek out previously unused portions of the electromagnetic spectrum. The "terahertz gap" (≈30 µm-3 mm) has attracted considerable attention from researchers seeking to bridge the gap between the optical/IR and microwave spectrum. [5,6] Similar to the optical domain, the invention, optimization, and commercialization of discrete components such as sources, modulators, and detectors are necessary for the widespread use and integration of terahertz technologies. Electronic means of terahertz generation utilizing semiconductors (Si, GaAs) IMPATT [7] and Gunn diodes [8] have been developed. In conjunction with a frequency doubler/ tripler circuits, they typically operate on the lower end of the terahertz spectrum (0.1-1 THz); although the power output at higher frequency multiples might be significantly lower as compared to its fundamental mode. Additionally, InGaAs/ InP HBTs and InP HEMTs with cutoff frequencies >600 GHz have been demonstrated. [9,10] The advent of femtosecond lasers has paved the way for the generation of terahertz radiation via photoconductive switches, [11] photo-Dember effect [12,13] and nonlinear optical rectification in organic and inorganic crystals. [14][15][16] Femtosecond lasers have helped develop time domain terahertz systems that have been instrumental in ultrafast spectroscopy to study transient carrier dynamics of semiconductors. Development of terahertz quantum cascade lasers (THz-QCL) employing intersubband transitions in AlGaAs/GaAs quantum wells [17][18][19][20] is a notable milestone in terahertz lasing. In a complementary fashion, terahertz detection could be performed by electro-optic sampling in nonlinear crystals, [21] photoconductive antennas on low-temperature GaAs, [22,23] plasma wave oscillation in a field-effect channel, [24,25] etc. Finally, akin to the compact and economic components available at optical frequencies for the generation, manipulation, and detection, terahertz technology requires Terahertz waves spanning over the 0.1 to 10 THz region of the electromagnetic spectrum have attracted significant attention owing to a variety of potential applications such as short-range high-speed data transmission, noninvasive screening and detection, materials characterization, spectroscopy, etc. This has resulted in massive strides in the development of essential system components such as broadband terahertz sources, detector arrays with high responsivity, as well as...

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“…11 shows the transmission curves for different values of the graphene chemical potential for the case with dielectric substrate. The typical value μ c = 0.5 eV [16], [17]…”

Section: Variation Of the Graphene Chemical Potentialmentioning

confidence: 99%

Theoretical Study of Plasmonically Induced Transparency Effect in Arrays of Graphene-Based Double Disk Resonators

Portela

Dmitriev

Oliveira

et al. 2019

J. Microw. Optoelectron. Electromagn. Appl.

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In this paper, we consider coupled disk-shaped resonators separated by a thin dielectric substrate that can be used as frequency-tunable filters or as electromagnetic switches in the terahertz frequency band. The two disks are electromagnetically coupled and resonate with dipole plasmonic modes. By using a Temporal Coupled-Mode Theory based approach, we show how to analytically calculate the frequency response of such structures.The analytical results are in good agreement with those obtained from computational simulations based on the finite element method.

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Tunable ultrasensitive terahertz sensor based on complementary graphene metamaterials

Abstract: In this paper, we propose an ultrasensitive terahertz sensor based on the complementary graphene metamaterial composed of wire-slot and split-ring resonator slot array structure.

Cited by 65 publications

References 32 publications

Terahertz Spectroscopy and Imaging: A Cutting-Edge Method for Diagnosing Digestive Cancers

Terahertz Spectroscopy and Imaging: A Cutting-Edge Method for Diagnosing Digestive Cancers

2D Materials for Terahertz Modulation

Theoretical Study of Plasmonically Induced Transparency Effect in Arrays of Graphene-Based Double Disk Resonators

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