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Open AccessArticle

Biomedical Sensing with Free-Standing Complementary Supercell Terahertz Metasurfaces

Biomedical Engineering Department, College of Engineering, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia
Crystals 2020, 10(5), 372; https://doi.org/10.3390/cryst10050372
Received: 7 April 2020 / Revised: 29 April 2020 / Accepted: 4 May 2020 / Published: 6 May 2020
(This article belongs to the Special Issue Polarization-Handling Metasurfaces)
We present a free-standing terahertz metasurface supercell that consists of four complementary mirrored asymmetric split-rectangular resonators. The quality factor of the excited resonance of this supercell has been significantly improved by 250% when compared to its counterpart nonmirrored supercell. The mirroring of the resonators leads to an enhanced out-of-phase oscillating current in each neighboring resonators of the supercell. In turn, this leads to a suppression of the dipole moments and its corresponding scattered fields. Moreover, this design can be realized by utilizing a simple laser machining technique. Furthermore, we numerically evaluate the performance of this design as a label-free biosensor for thin-film analytes and biomolecules such as double-stranded DNA and single-stranded RNA viruses. A sensitivity level of 1.14 × 105 nm/refractive index unit (RIU) can be achieved using this design. Therefore, this design has the potential to be used as an effective label-free biomedical sensor for in-situ detection of various biomolecules. View Full-Text
Keywords: terahertz technology; complementary split-ring resonators; Babinet’s principle; biosensing terahertz technology; complementary split-ring resonators; Babinet’s principle; biosensing
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Al-Naib, I. Biomedical Sensing with Free-Standing Complementary Supercell Terahertz Metasurfaces. Crystals 2020, 10, 372.

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