Free-Standing Complementary Asymmetric Metasurface for Terahertz Sensing Applications

Taleb, Fatima; Al-Naib, Ibraheem; Koch, Martin

doi:10.3390/s20082265

Cited by 26 publications

(22 citation statements)

References 51 publications

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“…A freestanding complementary asymmetric SRR surface for terahertz sensing applications with a sensitivity of 91.7 GHz/RIU is recently proposed. 32 In this paper, we present a new simple compact highquality factor single-particle metamaterial combining the asymmetry and principle of SRR for high Q. The application of the developed high Q resonator for an electrically small planar amplitude and phase sensor is also validated with simulations and measurements.…”

Section: Introductionmentioning

confidence: 95%

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A simple electrically small microwave sensor based on complementary asymmetric single split resonator for dielectric characterization of solids and liquids

Viswanathan

Moolat

Mani

et al. 2020

Int J RF Microw Comput Aided Eng

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The article presents an asymmetric single split resonator (ASSR) unit cell, its resonant properties, and an electrically small microwave sensor employing the complementary asymmetric single split resonator (CASSR) structure with high quality factor (Q) on the FR4 substrate. The structure is compared with the conventional symmetric split ring resonator. The CASSR sensor designed and fabricated on a substrate of dielectric constant 4.4 and a thickness 1.6 mm has an electrically small size of 0.127λ 0 × 0.127λ 0 × 0.007λ 0 at 1.27 GHz, which yields ka = 0.56 < 1 with low radiation efficiency. The properties and performance of the proposed CASSR for extracting the permittivity of both solid and liquid samples using amplitude and phase sensing in a simple lab-in-touch approach are validated with full-wave simulations and experimental results.

show abstract

Section: Introductionmentioning

confidence: 95%

“…All the above mentioned structural asymmetries are concerned with the asymmetry caused by the shifting of gap/slit in split‐ring resonators which is rather complicated. A free‐standing complementary asymmetric SRR surface for terahertz sensing applications with a sensitivity of 91.7 GHz/RIU is recently proposed 32 …”

Section: Introductionmentioning

confidence: 99%

A simple electrically small microwave sensor based on complementary asymmetric single split resonator for dielectric characterization of solids and liquids

Viswanathan

Moolat

Mani

et al. 2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…The sensing performance can be improved by enhancing the EM field on the site of the analyte by increasing the quality factor (Q factor). Taleb et al presented a free-standing metamaterial resonator with an asymmetric structure leading to a Fano resonance with a high Q factor [11]. Weisenstein et.…”

Section: Introductionmentioning

confidence: 99%

Photonic Crystal Resonator in the Millimeter/Terahertz Range as a Thin Film Sensor for Future Biosensor Applications

Zhao

Vora

et al. 2022

J Infrared Milli Terahz Waves

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With recent developments, terahertz (THz) technology has attracted great interest in many different fields of research and application. In particular, biosensors that detect a thin film of captured pathogens are in high demand for rapid diagnosis. Based on the interaction between analytes under test and electromagnetic (EM) field, THz resonators are sensitive to changes in the permittivity of the analyte and have the potential to become sensitive thin-film sensors. However, conventional metamaterial methods have low Q factors, leading to small amplitude variations and ambiguous detection. Here, we present a photonic crystal (PhC)–based resonator with a high Q factor that is sensitive to a monolayer of beads in the µm size range. The PhC resonator made of high resistivity silicon (HRSi) shows a Q factor of 750, which is much higher compared to metamaterial-based methods. Its resonance shift is linearly related to the coverage of the micron-sized beads on its surface. Moreover, simulation results with a thin film model of a single layer of the beads showed agreement with the experimental results. Although the achieved sensitivity needs to be improved by enhancing the field concentration on the analyte, our results suggest that THz PhC resonators with high Q factor are promising for biosensing applications. We anticipate our work to be a starting point for biochips with improved sensing capabilities and more functionality.

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“…So far, the majority of metamaterial designs were based on ring resonator geometries, typically split-ring resonators (SRRs), which can be also defined as simple inductor-capacitor (LC) circuits with the resonance frequency scaled inversely with their lateral size [5]. Metamaterials allow for a design of the spatial distribution of optical constants with a finer resolution than the wavelength, and thereby realize useful and novel devices such as very thin and flat lenses [6][7][8][9][10][11][12][13][14][15], invisibility cloaks [16][17][18][19], sensors [20][21][22], and imaging [23,24] at various frequency bands.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Asymmetry in Active Split-Ring Resonators to Design Circulating-Current Eigenmode: Demonstration of Beamsteering and Focal-Length Control toward Reconfigurable Intelligent Surface

Kitayama

Pander

Takahashi

2022

Sensors

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In this work, toward an intelligent radio environment for 5G/6G, design methodologies of active split-ring resonators (SRRs) for more efficient dynamic control of metasurfaces are investigated. The relationship between the excitation of circulating-current eigenmode and the asymmetric structure of SRRs is numerically analyzed, and it is clarified that the excitation of the circulating-current mode is difficult when the level of asymmetry of the current path is decreased by the addition of large capacitance such as from semiconductor-based devices. To avoid change in the asymmetry, we incorporated an additional gap (slit) in the SRRs, which enabled us to excite the circulating-current mode even when a large capacitance was implemented. Prototype devices were fabricated according to this design methodology, and by the control of the intensity/phase distribution, the variable focal-length and beamsteering capabilities of the transmitted waves were demonstrated, indicating the high effectiveness of the design. The presented design methodology can be applied not only to the demonstrated case of discrete varactors, but also to various other active metamaterials, such as semiconductor-integrated types for operating in the millimeter and submillimeter frequency bands as potential candidates for future 6G systems.

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Free-Standing Complementary Asymmetric Metasurface for Terahertz Sensing Applications

Cited by 26 publications

References 51 publications

A simple electrically small microwave sensor based on complementary asymmetric single split resonator for dielectric characterization of solids and liquids

A simple electrically small microwave sensor based on complementary asymmetric single split resonator for dielectric characterization of solids and liquids

Photonic Crystal Resonator in the Millimeter/Terahertz Range as a Thin Film Sensor for Future Biosensor Applications

Analysis of Asymmetry in Active Split-Ring Resonators to Design Circulating-Current Eigenmode: Demonstration of Beamsteering and Focal-Length Control toward Reconfigurable Intelligent Surface

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