Highly Sensitive Terahertz Metamaterial Sensor

A novel design of nearly perfect metamaterial absorber is proposed and analyzed for terahertz sensing applications. The full vectorial finite element method is used to simulate and analyze the reported design. The suggested structure is based on increasing the confinement of both electric and magnet...

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Bibliographic Details
Published in:IEEE sensors journal Vol. 19; no. 18; pp. 7993 - 7999
Main Authors: Saadeldin, A. Samy, Hameed, Mohamed Farhat O., Elkaramany, Essam M. A., Obayya, Salah S. A.
Format: Journal Article
Language:English
Published: New York IEEE 15.09.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Absorbers (materials)
Absorption
Absorptivity
Biomedical materials
Computer simulation
Figure of merit
Finite element method
Gold
Magnetic materials
Metamaterial absorber
metamaterial sensor
Metamaterials
Refractivity
Resonant frequency
Sensitivity
Sensors
terahertz frequency range
Thickness
ISSN:1530-437X, 1558-1748
Online Access:Get full text
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Summary:A novel design of nearly perfect metamaterial absorber is proposed and analyzed for terahertz sensing applications. The full vectorial finite element method is used to simulate and analyze the reported design. The suggested structure is based on increasing the confinement of both electric and magnetic fields simultaneously at the resonance frequency. Therefore, an absorptivity of 0.99 is achieved at 2.249 THz with a narrow resonant peak and a <inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula>-factor of 22.05. The resonance frequency is sensitive to the surrounding medium refractive index at fixed analyte thickness. Consequently, the reported metamaterial design can be used as a refractive index (RI) sensor with the high sensitivity of 300 GHz/RIU and the figure of merit (FoM) of 2.94 through an RI range from 1.0 to 1.39 at the analyte thickness of <inline-formula> <tex-math notation="LaTeX">1.0~ \mu \text{m} </tex-math></inline-formula>. Furthermore, the proposed sensor has a sensitivity of 23.7 GHz/<inline-formula> <tex-math notation="LaTeX">\mu \text{m} </tex-math></inline-formula> for the detection of the sensing layer thickness variation at the fixed analyte RI of 1.35. It is worth noting that most of the biomedical samples have a refractive index range from 1.3 to 1.39. Therefore, the reported sensor can be used for biomedical applications with high sensitivity.
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ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2019.2918214